Questions tagged [geology]

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

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4 votes
1 answer
61 views

How would about a dozen 50 ft to 1,400 ft (approx. 15 m to 430 m) giants wandering around a continent affect seismic activity?

8 of the giants would be around 50-100 ft (15-30 m) and only one would be 1,400 ft (430 m), the other three would be about 500-800 ft (152-243 m). Let's say that they are somehow remarkably light for ...
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7 votes
5 answers
378 views

How could an iron planet be geologically active?

So I have an iron planet, and its name is Randall. Since Randall is an iron planet, he is basically the core of a planet with no crust/mantle, and very few silicates. Now, I, the creator outside of ...
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8 votes
6 answers
799 views

What is the maximum amount of land (percentage-wise) a habitable planet can have?

Earth is our only example of a habitable planet. The surface of Earth is 29% land and 71% ocean. I am wondering what other land ratios can create a habitable planet. Half a billion years ago, Earth ...
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5 votes
5 answers
930 views

Turning possible a gigantic rock in the sky (sci-fi and magic)

Ok, we have magic to solve all my problems but I want to find if I can solve this "the most cientific possible". I have a world that turns out to be the earth but in a post-apocalyptic ...
4 votes
2 answers
150 views

How large of a magma chamber do I need to geothermally power a small city?

I have a fictional civilization that lives on a continent (or world) with a perpetually cold, wintry climate. The continent does have a large number of volcanoes of varying sizes and levels of ...
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2 votes
1 answer
113 views

What biomes would Atlantis (mythical land in the Atlantic Ocean) have? [closed]

Atlantis is a mythical continent from Plato's writings. It was an advanced island that rivaled Athens. It lost favor with the Greek gods and as a result it fell beneath the waves. Neat story but I'm ...
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5 votes
3 answers
294 views

What would happen if Olympus mons erupted?

The Tharsis range is a quartet of immense volcanoes on Mars, one of which, Olympus Mons, is largest in the solar system. It is so vast that it cannot be seen from the surface; should you stand it’s ...
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1 vote
1 answer
49 views

On an Earth-like planet, what geologic features would contain which important minerals (such as gold, iron, copper)? [closed]

I'm writing a book that's set on a planet very similar to earth, meaning it has all the same gravity, mineral compositions, and geologic features. With that in mind: What geological features are the ...
2 votes
1 answer
151 views

What biomes would Gondwana, a supercontinent consisting of South America and Africa have?

Hundreds of millions of years ago, there was a supercontinent named Pangaea that had almost every landmass on Earth. Later on, that landmass drifted apart into continents. It first became smaller ...
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5 votes
4 answers
2k views

Alcohol from the ground

I remember reading about ethanol that's able to be found trapped within rocks, but I sincerely cannot find the source, so here I am. I'm trying to understand how that works. I want to magnify it in my ...
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3 votes
1 answer
77 views

What climate would Kumari Kandam have (a mythical continent on the Indian Ocean)?

Kumari Kandam was another mythical continent. It was believed to be host to an ancient Tamil civilization. Such a land was mentioned in ancient Tamil writings. Europeans picked up on the idea to ...
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2 votes
2 answers
278 views

Building materials for a palace or castle on a volcanic island?

I have a magical setting I am working on in my world that is based on a large volcanic island that has been created by a sunken, fantastically large caldera. Up to this point, my story has centered ...
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12 votes
6 answers
2k views

Under what conditions could a gold planet form?

So, I am imagining a draconic alien species which, (don’t laugh) inhabit a planetary system that is particularly rich in heavy elements such as platinum, silver, and yes, gold. (I said don’t laugh!) ...
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2 votes
0 answers
63 views

How would the coastlines of a chemical sea on a planet with extreme winds form?

On one of my pet projects, there is a chemical sea similar to the Black Sea if it had the saline content of Lake Natron; extreme density of chemicals in the soil and from vents. It's about the size of ...
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0 votes
2 answers
185 views

What would happen to enormous indestructible ruins after 400 million years? [closed]

Suppose you had ruins (and I use the term lightly) that could survive nearly any disaster and any erosion. How likely are they to be buried, subsumed into the mantle, or end up at the bottom of the ...
  • 986
1 vote
1 answer
71 views

Extreme winds creating windy canyons

On a planet I've been working on that has extreme wind conditions, coastal zephyrs cross through mountains and get split into stream-like avenues that carve deep gouges in the rainshadowed valley ...
  • 986
3 votes
1 answer
157 views

What metal or mineral commonly found on Earth could be extremely rare on a different Earth-like planet?

I am writing a story where a secret organization in the present day controls a portal between Earth and a different Earth-like planet. The organization secretly ships resources between planets to make ...
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6 votes
6 answers
1k views

How to tunnel to a planet’s core

One of the main problems with creating a magnetic field around Mars, (which would be necessary for terraforming the planet) is that most proposed systems require some artificial device to sustain it. (...
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8 votes
4 answers
2k views

Can I Have a Semi-Liquid "Sea" of Sand?

I am thinking of adding an element to my world that is primarily desert that consists of a semi liquid sea of possibly high silica sand that's inundated with salt water. Would such a mixture have the ...
10 votes
5 answers
400 views

Can my planet be gradually eroded by solar wind over 6 billion years?

The planet is a barren rocky dwarf planet which orbits at 0.05 AU from its star of 0.9 solar masses, at 6 billion years old. Because of this, it’s surface is melting and evaporating, forming a thin ...
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7 votes
7 answers
2k views

How could someone induce a cave-in quickly in a medieval-ish setting?

The idea here is that a commander of an army intentionally caves in a cave for a tactical benefit, and this needs to happen quickly. The best ideas i had were either explosives (obvious, but maybe ...
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4 votes
2 answers
303 views

Food chain based in geothermal heat?

Underground dwarven (and other) civilizations are a staple of fantasy worlds. The obvious question (what do these people eat?) is rarely answered. As an explanation, I considered a food chain based in ...
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4 votes
1 answer
88 views

What could make an exomoon sand-colored, other than just being covered in sand?

So I'm currently working on a set of scientifically plausible star systems, and I want to make one of the moons of a planet colored in patches of medium brown and pale brown dust/rock, but I can't ...
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-1 votes
1 answer
89 views

Can an object become flammable by being dipped in an arsenic lake?

I have a (water) lake on a planet that has a high concentration of arsenic in its crust. As a result, the lake has an extremely high concentration of aqueous arsenic. From my research, it seems like ...
7 votes
4 answers
1k views

What might happen to plastic after millions of years of geological activity?

I'm considering a worldbuilding exercise focusing on a "second generation" civilization, which arises after a previous civilization from millions of years ago either died off or left the ...
2 votes
2 answers
90 views

How plausible is my alien world? Effects of acidification

The theoretical world of Hēdran is the 2nd planet of a 7 planet system. It lies within its star' s (a G1.4) habitable zone, but with a hot jupiter gas giant only ~1 AU away it experiences heavy ...
2 votes
2 answers
213 views

On an alien planet, what kind of geological phenomenon can create a crystal mountains range?

Context: In my speculative evolution project, I've created a biome where the snowy tops of mountains have been replaced with crystals. The crystal should come from inside the planet, just like lava.
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5 votes
2 answers
264 views

Is colonization through underground tunnels possible? [duplicate]

I am thinking of a scenario in which a tunnel linking Hungary to Morocco is built around the 1500s by the King of Hungary in an attempt to colonize Morocco to get a border with the Atlantic ocean. ...
3 votes
1 answer
61 views

Acidic oceans on geologic timescales?

Lots of biochemical processes are sensitive to pH, and most (all?) organisms maintain close-to-neutral internal pH, except for specific localized excursions for specific purposes (like producing acids ...
5 votes
2 answers
233 views

How would Earth's land be different climatically if it was 50% land and 50% water?

I'm coming up with an alternate world that is far more balanced when it comes to the surface area. Real life Earth is 71% ocean and 29% land. Astronomers speculate that Earth got its big oceans by ...
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13 votes
8 answers
4k views

Is it possible to make mortar without lime in a medieval-ish setting?

The world which I am working on is set in the far future on a colonized/terraformed planet that has become reduced to a medieval-like level of technology. It was not previously inhabited by any life, ...
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3 votes
1 answer
123 views

What would the terrain be like along the migratory track for a species of gigafauna?

What would the terrain look like when you have city-sized creatures regularly passing over it? The best real life analogue I could think of would be the Canadian Shield where the glaciers scraped back ...
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3 votes
2 answers
100 views

Major underground caverns on a world with considerable geologic activity?

The world I designed, while habitable and capable of hosting carbon based life is characterized by a considerable volcanic and seismic activity caused by the tidal heating of the gas giant it orbits. ...
3 votes
1 answer
145 views

Can people survive at the bottom of the dry Red Sea?

In 2055, a coalition of world powers completed the Red Sea Dam, a 30-km structure spanning the Bab-el-Mandeb at the south end of the sea. Construction of the dam was initially proposed to permit the ...
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3 votes
1 answer
137 views

Can you build convection currents out of hollow air?

Recently, I found this image by the Redditor "Keeperofbeesandtruth": He made it free to use, as he doesn't intend on being serious about his own project. So here's my plan: Keep the ...
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1 vote
7 answers
2k views

Can Diesel be used as a fuel for hover jets? If so, how much? And what type of diesel would you mine from the ocean floor?

I'm developing a scavenger world set in a sort of dystopian future, and one faction has a huge monopoly on Diesel. As described as any fuel used in a compression chamber, they are able to obtain their ...
  • 986
7 votes
3 answers
68 views

Ferrovolcanism on an asteroid caused by rotating induction heating

I found out about Ferrovolcanism on asteroids and its a pretty neat idea for a space sci fi setting. Moreover, I have come up with a hypothetical way that an asteroid could be heated by induction ...
1 vote
1 answer
113 views

Would the sort of tectonic activity described below shorten Earth's lifespan?

The unfortunate truth is that hundreds of millions of years in the future, Earth will have used up all of its radioactive materials. And when that happens, tectonic activity will stop and magma will ...
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6 votes
7 answers
1k views

How did the vast nexus of hollows, caves and a thriving underworld on this alien planet come to be?

I had a unique idea for an alien planet. The surface would be snow-capped mountains and glacial fields, it's cold and essentially devoid of most life. But just underneath the towering mountains ...
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4 votes
1 answer
100 views

Life on a Moon-like Earth?

Aside from being smaller, the Moon has a distinctly different bulk composition from Earth--its mantle is proportionately much larger, and its core is proportionately much smaller. Suppose that Earth ...
10 votes
4 answers
2k views

Would a lower gravity planet have deeper oceans and higher continents?

I'm designing a lower gravity planet that's got enough mass to hold onto an atmosphere but around 75% of Earth's gravity. I read that lower-gravity planets will have more pronounced geological ...
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1 vote
2 answers
93 views

Would a high iron content world have particular effects on its more common minerals/elements?

I have a world which has a high iron content in its core, like a more extreme version of Mercury, geologically speaking. The system only has this world and a tidally locked hot Jovian (of which the ...
5 votes
3 answers
310 views

Is there any feasible way for Antarctica have hidden oases?

Antarctica is a large barren wasteland. Located at the bottom of the world, it appears far away and forgotten. The Earth's largest desert and yet the coldest landmass. The age of exploration has come ...
5 votes
4 answers
418 views

Is it possible for a planet to have floating islands caused by the magnetism? [duplicate]

I am working on this planet that has several moons and - possibly - rings. In the planet's earliest era after its inception, it was hit by a large meteor that dislodged huge chunks of earth. I'm ...
7 votes
2 answers
298 views

Countering gravitational bead instability

I started thinking about Alderson disks. They are usually portrayed with large uninhabitable sections on either side of the habitable zone. Why not just build the habitable zone, and save materials? (...
7 votes
0 answers
60 views

How would the landscape of a gas giant's core-mantle boundary look like? [closed]

In my setting, the characters live at the bottom of a gas giant's metallic hydrogen ocean, just above the rocky core. There the dense metallic hydrogen acts as the ‘air’ and the core as the ‘ground’ ...
5 votes
1 answer
207 views

How fast can people dig in rock using primitive methods? [closed]

Considering the fire setting method (where you light a fire in front of the rock, then pour water onto the fire and rock) and digging purely with unpowered hand tools, how long would it take to dig ...
4 votes
2 answers
162 views

A world like an ice-cream sandwich?

Ice-cream sandwich is the only way to describe the world I am thinking of making. There's flat land above, flat land below and mountains all around. The light comes from stars that hover in the middle ...
3 votes
1 answer
122 views

Two planets - "exchange orbit" scenario - Does it cause earthquakes?

I have an earth-like planet with a roughly earth-like orbital period, that is in a stable co-orbital scenario with another largish body. Similar to Janus and Epimetheus but planets rather than moons. ...
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4 votes
1 answer
96 views

Geologic explanation for green volcanic eruptions

It's well-documented that copper sulfate can be introduced to certain fuels to burn green. If one was to scale up the fireworks, so to speak, then I'm not so sure how to explain the mechanics of it ...

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