Questions tagged [geology]

For questions about rocks, minerals and the physical structure and substance of the world.

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7
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2answers
253 views

What would happen if a tungsten rod massing 1000kg slammed into the surface of Callisto at 15% of the speed of light?

I am writing a sci fi story and I want to know what would happen if a tungsten rod massing 1000kg slammed into the surface of Callisto at 15% of the speed of light? Given that there is a subsurface ...
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4answers
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Reef World 3 - Wandering Islands on the oceans of Reef World

Piggybacking on "Massive volcano on reef world?" Pumice is a porous volcanic rock that while hard is friable (can crumble). What if my “Olympus Mons” equivalent volcano on Reef World created ...
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2answers
119 views

How to Build the Fictional Continents Using Our Real Continents

Presented here is a map of Earth with the fictional continents resurfaced, by the Redditor "Stagman1111": Source From left to right, the presented additional continents are Mu, Atlantis and ...
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6answers
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Possible reef world?

Piggybacking off this question: Shallow sea world - plausable geology? what would we need to have a world covered in reef? An entire world of this: If I understood them correctly the previous ...
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2answers
101 views

What POD Would I Need For Earth's Lost Worlds to Exist Today?

This is a map of Earth as depicted by the DeviantArtist ToonHolt: As you can see, many new landmasses have been added, from lost worlds like Sundaland, Zealandia and Kerguelen, to fictional worlds ...
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1answer
86 views

Could a land mass reasonably exist where I want it on my earth-like binary planet? [closed]

I've been doing a lot of research lately on my binary planet system for the series I'm writing. Some details I've already worked out: The system's star is 0.6 solar masses, 0.8 solar radii and 0.3 ...
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1answer
68 views

Can a water world be turned into a dryer habitable planet by an early runaway greenhouse effect?

Consider an Earth clone with oceans several hundred kilometers deep, potentially deep enough to solidify into exotic ices. Such a planet would lose its initial hydrogen and helium atmosphere when the ...
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4answers
506 views

What kinds of minerals or compounds could radiate heat?

I'm working on an RPG in a world with some magical elements, like a type of energy (so far unnamed) inherent in animals and humans. Those with high amounts of this life energy in them are thought of ...
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1answer
319 views

Planet with natural process(es) that results in cube-shaped mountains

Premise The task is to explain how a planet can possess cube-shaped mountain ranges and maintain them across geological time scales. I have tossed around several ideas, such as creating a vacuum ...
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6answers
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A planet without the materials to make jet engines — plausible? [closed]

A continuation of Are there *plausible* planetary conditions where jet aircraft just don't have much advantage over propeller-driven aircraft? OBJECTIVE: A planet where propeller-driven aircraft ...
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2answers
344 views

Massive volcano on reef world?

Piggybacking on my previous question: Possible reef world? An answer in that question included that reef world is an "old, old world. (So)The core has frozen and plate tectonics have stopped...&...
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6answers
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Asteroid impact. How big does it have to be to globally affect plate tectonics?

I want to know about the plausibility and required parameters of the following scenario: Take an Earth-like planet, about the same size, composition and gravity. It has no plate tectonics to speak of....
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6answers
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Reasons for insanely huge precious metal deposits?

In my book series, there is this extremely rich Earthlike planet called Aurea whose claim to fame is supplying the vast majority of the galaxy’s precious metals (gold and silver for the purposes of ...
2
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1answer
100 views

Magic liquid that falls like rain, how will that affect the weather patterns and landscape? [closed]

So, my knowledge of weather patterns and geology is very limited, but I'm writing a book where magic is an abundant liquid substance that behaves similarly to water. I'm not sure exactly what it'll be ...
4
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2answers
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What will Glacier Bay National Park look like in 2000 years?

I am working on a story that takes place roughly 2000 years after a worst-case-scenario climate apocalypse. It revolves around a society located in present-day Glacier Bay National Park on the Alaska/...
4
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3answers
808 views

How fast and how would fjords erode?

I'm working on a world that hasn't had an ice age in 250 million years and looking at how to shape the coasts. I'm thinking about fjords (also glacial lakes) and trying to figure out if they would ...
6
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1answer
207 views

Can a fast planetary rotation create a planet with an equatorial continent, preferably with very high mountains and two polar oceans?

I’m trying to create a planet with two small polar oceans with equatorial supercontinent in the middle. The land is in turn divided in two by high mountains that act as barrier and a source of water ...
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1answer
68 views

What would be the effects on terrain of an atomic bomb on a Sahelian or Saharan grassland or desert?

So, I'm coming up with a world in which, after a nuclear war in Africa, there is a bunker in the country of Chad. The landscape has been affected by over 50 atomic bombs. The main characters leave the ...
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7answers
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Reasons for a very small but very high mountain range in an area with no plate boundaries?

One of the cities in my world, known as Kerkapeze, is situated in a location I just realized I'd have to be very creative to justify: it lies on a narrow plateau between two high but very small ...
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1answer
134 views

How would a submerged continent quickly rising to the surface affect the geography of its surrounding lamdmass? [closed]

Long ao, a philosopher wrote about a city called atlantis. This nation was a dominant force in the world until it lost a war with Athens, sinking into the sea. However, the simple minded buffoon got ...
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8answers
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Why do dwarves usually live in mountains?

This is as much a question as it is a thought that I've had. You see, folding mountains (as in made by tectonic plates movement) are very poor in heavy minerals like metals, and they seem to be the ...
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3answers
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Would it be Possible to Extract Helium in a World Without Fossil Fuels?

I understand that on Earth, we mainly get our helium from natural gas deposits, which traps helium atoms generated from radioactive decay. Would this process still work on a terrestrial planet without ...
6
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2answers
377 views

What would happen on the surface of a terrestrial planet captured by a gas giant?

So, from what I've read of Porter & Grundy (2011), most gas giant planets orbiting within their star's habitable zones are thought to have migrated there from further out in the solar system, with ...
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0answers
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Geology and climate etc on a earth size habitable moon of a gas giant [closed]

A bit of background: I'm in the beginning stages of creating a habitable moon orbiting a gas giant. The conditions I have so far for this are: The moon itself is more or less Earth-size, and the gas ...
3
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1answer
161 views

Mountain heights - theoretical limits

I have a country bounded on three sides by fold mountains. Due to a magical plot device, the force acting to drive the upward motion of the mountains persists indefinitely, acting on the plates ...
6
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1answer
80 views

Would an asteroid colliding with a terrestrial planet result in the creation of extensive caves nearby the crater?

I just did some research on the Chicxulub crater in the Yucatán Peninsula in Mexico, which is the crater from the asteroid responsible for the extinction of the dinosaurs. Yucatán itself does have ...
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5answers
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Is there something wrong with my fictional lighthouse?

I'm writing a story of a fictional location on Earth, or a very Earth-like world, perhaps set in the late 1800s, or at some point when lighthouses were still in use. It's located on the Eastern end of ...
14
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5answers
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What factors influence what kind of shoreline you get?

I'm writing about a group of colonists on an Earthlike world, where I want to get the geography realistically correct, and it occurs to me that one thing I have not really seen discussed is the nature ...
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2answers
108 views

Would it be possible to have predictable, repeating volcanic eruptions on an inhabited island?

So, suppose we have a very large island. Exactly how big it is doesn't matter too much, but it must be big enough to support a small country. This is a volcanic island, and the volcanoes on this ...
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3answers
222 views

How to dry an ocean planet and NOT turn it into a salty desert?

So, Here's the scenario: we start with an ocean planet, with minimal dry land. The planet stays this way for at least 400 million years. (Notably, life evolves during this time period.) Then, a magic ...
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4answers
225 views

What would an until-recently waterworld look like?

So, suppose a world that, for most of its biological history, was a water world, with minimal dry land. Starting from the Cambrian Explosion analogue, the world stays like this for roughly 460 million ...
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4answers
263 views

Giant caves. How do they form?

In many fantasy works, the world typically has giant caverns that house entire civilizations and ecosystems that are (mostly) disconnected from the world above. However, this concept, at least in an ...
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4answers
411 views

What environmental conditions would result in Crude oil being far easier to access than coal?

So, A bit of a long winded explanation: I am designing a world that is meant to be both nostalgic and alien; A world that is familiar enough at first glance, but has many differences to ours. One ...
6
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6answers
634 views

How can a troglodytic society democratize braille literature?

Premise The surface of my world cannot support life. The inhabitants of my world sustain themselves off troglophauna and aquifers. I'm leaving the mechanics of where energy comes from in this shadow-...
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3answers
111 views

how to cause a supervolcanic eruption

I want to make use of the Toba Catastrophe Theory in my story. From Wikipedia: The Youngest Toba eruption was a supervolcanic eruption that occurred around 75,000 years ago at the site of present-day ...
2
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1answer
162 views

Valles - a world of deep canyons, could it work?

I’m developing Valles - a world of deep canyons, and I need some opinion on geology, hydrology and climate. Valles has earthlike mass and density (for simplicity sake). Planet’s surface is a desert. ...
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7answers
3k views

How to get blue sand

I want to have a blue furred species native to a desert in the world I'm building, so the obvious way to have that is to have the sand of that desert be blue so they are camouflaged. I could just say ...
4
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2answers
306 views

What would happen if the Somalian tectonic plate was suddenly lifted directly up?

I am writing a book where prior to the current events, an event caused by a magic surge resulted in the Somalian tectonic plate to be quickly lifted directly up enough to create a new continent. I was ...
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1answer
90 views

How does this island rotate without melting the whole half of the planet with friction?

My friend asked me if a 150-200 km wide island (more precisely, a lithospheric plate of such size) that rotates insanely fast by the geological terms, something around one rotation per week, is ...
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3answers
178 views

Longest “linear” natural formations

In an effort to gain inspiration for planetary formation and, at the same time, inspiration for governmental/territorial boundaries between residents of said formed planets, I've recently encountered ...
5
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2answers
135 views

How viable would it be to dig down on Mars to build an underground colony?

I want a colony on Mars that builds BOTH ways, up and down. Domes or structures that go up normally, but a large portion of the colony would be levels underground. I think this would allow you to take ...
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0answers
16 views

How high could a super-mountain get on a lower gravity planet (0.7g)? [duplicate]

I’m thinking of a world with one extremely high mountain that would factor prominently into the mythology of the civilizations. I’ve heard that it’s estimated that 10,000 meters is about as high as a ...
4
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1answer
134 views

Endless rain in a cave

I am currently designing an extensive big volcanic cave system located underneath a glacier, which contains a phenomenon of underground rain. The nearby volcano is still active, and heats the ice year ...
4
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4answers
377 views

Could a tsunami separate two landmasses?

I posed here a question about a super-earthquake separating a Pangaea-like continent in a matter of days. Unfortunately, one of the answers rightfully points out that such an earthquake would generate ...
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12answers
5k views

Ferrying an island with mortals on top. Is it possible without killing them?

Tolkien wrote on The Silmarillion about Tol Eressea, an island that the vala Ulmo (a god-like figure) used to ferry the elves back and forth across the sea into the Western lands. José Saramago also ...
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2answers
371 views

Would this be a plausible coastline + river combo?

So, for an area of my world, I'm imagining three cities situated along the stretch of a river, running from a lake in the mountains onto relatively flat terrain (though still a bit above sea level) ...
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2answers
97 views

UPDATED: What phenomena could be powerful enough to hide an island?

Edit: My original question concerned the magnetic properties of gems in this world. As I have realized more and more through the answers how unrealistic this is, I am now seeking input on any general ...
2
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2answers
81 views

Continental drift of a planet over 900 million years

Over the past 2 weeks, I've been attempting to create a planet with a plausible continental drift. I was really hoping to get some kind of response to my work. I'll stick up my hand and admit it right ...
2
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1answer
85 views

Planet covered in non-Newtonian fluid

Basically, I watched that horrible holiday special. The animated short that introduced our friend Boba Fett, and there’s a planet that’s apparently covered completely by a non-Newtonian fluid. What ...
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1answer
113 views

Determining maximum cave depth

I am planning on making this planet of caves, and it has cave systems that dwarf Earth's. It's got carbon-based life, a chemical composition rich in copper, a good amount of water, and less gravity ...

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