Questions tagged [geology]

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

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4
votes
1answer
104 views

Oceanic crust formation

I'm working on a earth-like planet with a much lower sea level (like 3000m so the mid-ocean ridge would form many islands) but is that even possible? Will the emerged ridge make some weird stuff and ...
6
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7answers
392 views

Natural barriers around medieval towns

I have a town, the capital of an empire. It covers 560 Hectares. What kind of natural barrier conforms to the following requirements: Is both heavily defensible and does not hinder trade all too much....
17
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6answers
5k views

Can a habitable planet have two separate crusts, both of which can sustain life?

Can a habitable planet have two separate crusts, both of which can sustain life? I am wondering if through the planet's creation, over time through some form of mantle cooling/erosion combination, ...
7
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2answers
1k views

How would coral reefs thrive on this super-earth world?

I have a super-earth world. The surface of the world is shallower due to extra gravity, so shorter mountain ranges and less ocean depths. The world orbits a binary star system at a distance of the ...
14
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6answers
3k views

What type of stone should I use for these hills?

The capital of a country is built on a series of stone hills that gradually lead to the ocean. The stone is noted for both the strength of castles made from it and its unique blue-green coloring. This ...
48
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2answers
6k views

How tall can a humanoid creature be without alerting the rest of the planet with earthquakes?

Planet is earth sized. Fantasy medieval setting that takes place on Continent A, which is on the other side of the planet from Continent B - about as far as South America is from Asia. Continent B ...
5
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2answers
215 views

Is a Continent of Karstic Plateaus Feasible

The Tsingy National Park is popular for its unique karstic plateaus. These karstic plateaus are thousands of large sharp pillars or needles that stretch towards the sky, creating a wide variety of ...
4
votes
1answer
134 views

The Rocky Side of the World Without Oil

Lately, there has been speculation of what would happen if all the untapped oil, by the handwaving powers of the gods of television and money, disappear overnight. It has been explained, in varying ...
5
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2answers
284 views

Starting with a map of current landforms, how can I write the geographic history of my planet?

The current worldbuilding project I have is going to be detailed - very detailed. It's about the life of an alien planet called Nemo 4, and I want to chronicle the evolutionary history of that life, ...
3
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2answers
216 views

Albedo of a planet like Crait

If a planet like Crait existed and was covered by (mostly) white sand, what would its average albedo be? Crait is a planet from Star Wars that has a thin layer of white salt on its surface.
12
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5answers
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Can fields be destroyed by water so that new ones need to be dug up?

I currently have a character whose fields are destroyed as they are at the base of a valley, and the rain has completely killed the seeds and waterlogged the dirt. Thus, main character needs to dig ...
-1
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2answers
1k views

How would the color of sand affect the color of glass?

So, I know that there are naturally occurring beaches that are various 'odd' colors like pink, black, green, and orange and I was wondering if the color of this sand would have any effects on the ...
2
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5answers
278 views

Effects of asteroid passing very close to the planet

I am trying to think of a natural event that causes very big impact to human lives - massive movements of people, shift of power, etc. This event happens in a medieval period on an earth-like planet. ...
6
votes
2answers
712 views

Is this reaction realistic enough?

I'm building a world which has, apart from the 'usual' stuff, 2 types of stones (haven't really decided on a name yet). Stone A holds some form of energy but when prompted by Stone B it will release ...
2
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4answers
311 views

Hyperdense Object

If a planet has a core of super-dense material, how might that effect the geological composition of that planet? Specifically: imagine a lunar-sized planet, with earth-like geology and density. If ...
6
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6answers
354 views

Could there be some kind of way for an underground jungle-like climate to occur

In my world, there would be a tropical region very similar to real life rain forests, though underground there's still jungle. At a point underground, there are huge caverns that are populated by ...
23
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6answers
5k views

How many tectonic plates should my planet have? And why?

While constructing a planet, with the same mass, volume and overall composition as Earth, how do I know how many tectonic plates should it have? And what does having more or fewer tectonic plates ...
4
votes
3answers
444 views

Would a lack of landmasses at the equator change climates closer to the poles?

I'm imagining an Earth-like world with a single large continent centered on the north pole, and not reaching entirely to the equator. As ocean currents play a large role in shaping weather, I'm ...
13
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7answers
2k views

Advanced civilization on planet with atmosphere only in large sinkholes

I want to have an Earth-sized planet (with similar gravity) with an extremely low-density atmosphere (comparable to Mars) at most of its surface. Complex life, including an information-age ...
29
votes
4answers
7k views

If the Black Sea was disconnected from the Mediterranean, how long would it take to become freshwater?

The Black Sea is a brackish body of water, that used to be separate from the Mediterranean. Further back, it was likely part of the Mediterranean before the last ice age. How long would it, or for a ...
8
votes
2answers
607 views

Is there anything wrong with my plate tectonics map?

Here is a map I just produced of the plate tectonics of a world I'm working on. Does anyone familiar with the subject see anything wrong with it? If you can differentiate between the penciled and the ...
4
votes
2answers
292 views

Can Off-shore Calderas Exist?

A caldera is usually the remnant of a volcanic eruption powerful enough to collapse the structure surrounding the magma chamber. Many of our examples, like Yellowstone, Crater Lake, Toba and even ...
38
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9answers
4k views

Evidence of spacetime anomaly in local geology?

My current project features a contemporary scientist who is convinced that some sort of spacetime anomaly occurred in a tiny rural Yorkshire, U.K. community circa-1850; he believes a dilapidated old ...
7
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2answers
685 views

Three of the Four Kinds of Volcanic Eruptions…Underwater

A volcanic eruption is measured in two constants--gas and viscosity. For clearance, low viscosity is like squirting water off a nozzle, whereas high viscosity is like squirting caramel off a nozzle, ...
8
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3answers
2k views

Coastal Mountain Ranges--In Which the Mountains are the Coast

One of the ways to create a major mountain range is a process called subduction. Here, heavy oceanic rock sinks beneath the lighter continental rock. The result--coastal mountain ranges like the ...
8
votes
1answer
263 views

What sort of habitats could exist Pre-Zanclean Flood which formed the Mediterranean Sea?

There is a lot of information on drying up a Mediterranean sized depression. However, there is not a lot of information on drowning such a large area or what sort of habitats could exist before the ...
-3
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2answers
131 views

What can cause the formation of a water canopy above the Earth's surface?

Here is a link to the water canopy theory. My question is: how this water could end up there, high above the surface? I was thinking about two possibilities: a comet spreading ice/water as it ...
9
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5answers
581 views

Could a nuclear explosion occur naturally on a planet with crazy enough (but still possible) conditions?

My question here is if there is any circumstance, however unlikely, that could lead to explosive nuclear fission that was not set off by intelligent creatures. I'm working on some bizarre planets for ...
70
votes
6answers
11k views

Would earthlike planets in other solar systems have well-known Earth gemstones such as rubies, emeralds and sapphires?

I'm currently working on a conworld that has never had any contact with Earth, and I'd like to create words for iconic gemstones, such as rubies, emeralds and sapphires. However, I can't help but ...
5
votes
4answers
310 views

Would naturally occuring room temperature superconductors affect a planet?

Say we have a planet, similar to Earth, which has deposits of a naturally occuring superconductor. Perhaps have it about as common as deposits of gold - Moderately rare, but occurs in veins as opposed ...
5
votes
2answers
155 views

How might the cooling of the Earth's core be accelerated?

Essentially, what would be the most efficient way of causing the Earth's core to cool as much as possible without damaging human civilization in any other way (the outcome can damage it, but not the ...
11
votes
2answers
177 views

Earthquake modeling on a fictitious extraterrestrial moon

Thanks in advance for any input you can provide! I have a moon called Vieneo http://www.risetvp.com/Vieneo which has some geological modelling of faults and epicenters over some range of time: What ...
9
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2answers
466 views

How to speed up continental drift?

What could cause the continents to drift much faster than is today. I mean, much faster. Let's say it should take about 1-2 million years from this to this
5
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1answer
433 views

What are the best books on geology and plate tectonics for worldbuilders?

I am trying to achieve the best possible accuracy for new planets, for determining landmasses and continents and then gravity, axial tilts, day length, tides, seasons and so, without going too deep ...
4
votes
3answers
410 views

Is it possible for a tectonic plate to be separating from all the plates around it?

So here's the picture, an island about the size of Sicily is on its own tectonic plate, it borders three other tectonic plates, it's separating from all of them at the exact same time. This is a ...
1
vote
2answers
263 views

Can a new volcano have metals inside?

If I were to use handwavium to raise a volcano in the middle of the sea, would it contain metals or ores large enough to be extracted by normal means, like mining with a pickaxe? Everything apart ...
3
votes
3answers
322 views

How to justify a scarcity of sulfur minerals, and the impact this might have on a fantasy world

I want to create a convincing world where gunpowder is a rare and expensive commodity, allowing swords and plate armour to still be used effectively despite the world having current level of ...
6
votes
2answers
422 views

How do I realistically portray continental drift on my map?

I'm still fiddling with my map, and I got to thinking about continental drift. My world has two large large continents and a couple of other notable landmasses between the size of Iceland and ...
7
votes
1answer
449 views

Can I have a beach of pearls?

Far south-west of the main continent exists an island in a shape of crescent moon with dense jungles and slender mountain peaks and a single city named Kalt stands in a place where the islands' ...
9
votes
3answers
756 views

Is an offset mountain range plausible?

For my world, I would like a coastal mountain range that partway along its length is offset by a few (say, 100) kilometres, forming a pass through the mountains, like so: (N.B. I've drawn this very ...
8
votes
1answer
1k views

Tips and principles for creating an accurate elevation map?

I'm continuing to hash out the map of my world, using tutorials found on this site and elsewhere. In some tutorials the starting elevation levels of a planet are treated pretty randomly, implying ...
6
votes
5answers
702 views

How would the landscape appear under the influence of extreme windstorms?

I'm building a world with almost weekly extreme windstorms, driving the residents to either live underground or in the 'wind shadow' of sealed-off valleys. To sum up the windstorms' power, "You know ...
4
votes
2answers
155 views

What is a plausible way to fuel highly active volcanism and seismic activity on my planet?

I thought that a large, close moon might help generate enough heat and stress to raise the average temperature on my world and stave off a Snowball Earth scenario. According to this article and this ...
8
votes
1answer
251 views

Where to find equations to calculate tidal heating in a binary planet/planetesimal system?

I'm building a very small homeworld (0.602 M$_e$) with a very large moon (0.0711 M$_e$) that orbit each other at a barycenter about 7.12 planetary radii (1 R = 0.870 R$_e$) from the primary's center; ...
18
votes
3answers
2k views

Could ancient seeds buried deep in subsoil sprout given the right conditions?

A friend of mine was telling me about a story where a man clear cut a diverse ecosystem of plants in an area similar to size and shape of a small caldera (not necessarily a caldera itself). ...
8
votes
1answer
391 views

How do I form a location like the Ethiopian highlands?

I'm continuing to work on my map, and one thing that's giving me difficulty is figuring out the geology of a region that I wanted to be similar to the Ethiopian highlands and African rift valley. This ...
0
votes
2answers
140 views

Could there be a plausible description for a kind of radioactive ore that can amplify the energy of a host or object, or potentially destroy it? [closed]

This kind of ore should be rare (maybe from meteorites?), dangerous (radioactive?), but potentially very useful in a world where people have augmented abilities, cybernetic attachments, that sort of ...
5
votes
1answer
337 views

What would happen if the earth was thrown into the interstellar medium? [closed]

So, for some reason the sun has randomly disappeared. The earth, along with the rest of the solar system, have been thrown out into interstellar space. Obviously, temperatures will plunge to levels ...
5
votes
2answers
474 views

Could I get some guidance on this map in progress?

BACKGROUND So I was working on a map, when I suddenly realized that despite the many helpful tutorials on this site I have very little idea what I'm doing. I thought it might be a good idea to put on ...
18
votes
1answer
2k views

Would an island where the majority of the rock is lapis lazuli be feasible?

While the reasons for it's existence do not matter as it is part of an artificially created planet, I am curious if a lapis lazuli island would be able to survive erosion and support Earth-like life? ...

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