49
votes
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Is there sand in Antarctica?
Yes. In fact, there are sand-dunes in Antarctica [1:15].
18
votes
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What is this weird looking structure in Ethiopian desert?
Zoom in for the clues. The lines are not radiating out from the village, but from the cattle kraals. These kraals are irregular enclosures built of acacia thorn, agave and other thorny bushes. The ...
- 14.2k
17
votes
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How did the Ural mountains form?
The Ural mountains are one of the oldest mountain ranges on Earth. They started forming about 300 Ma ago by the subduction of the oceanic crust once attached to the Kazakhstania plate under the ...
- 17.6k
16
votes
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Why are deserts mostly located on the western side of continents?
Some of the driest deserts on Earth occur in the western side of continents and they are called Coastal Deserts. Examples of such deserts are the Atacama desert (Chile, the driest desert on Earth), ...
- 15.4k
14
votes
Could a massive flood have formed the Grand Canyon?
tl;dr: no.
Long answer:
First of all, like mentioned by others in the comments, you would need some physical mechanism to take a whole lot of water, evaporate it, and drop it at once at a place ...
- 23.1k
14
votes
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How are giant sinkholes filled up?
How Japan Filled That Ginormous Sinkhole In Just One Week:
The Fukuoka sinkhole measuring 8,700 square feet (808 square meter), 65 foot (20 m) deep: they poured a mixture of soil, water, and cement ...
- 2,679
14
votes
Is there sand in Antarctica?
This LiveScience article suggests the areas aren't major:
The scant areas that are free of snow and ice make up less than 0.4
percent of the continental land mass. In places there, the wind has
built ...
- 8,713
12
votes
How do long rivers exist?
I will attempt at rephrasing your interesting question after these considerations:
At the continental scale, flowing water has no significant inertia, so water flows following the maximum slope. A ...
- 1,723
12
votes
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Strange craters in Afghanistan
These are qanats, a type of antique drainage system common in arid climate regions of the Middle East, particularly in Iran (as mentioned by @Spencer @Winwaed). Some of those are still in use for ...
- 2,633
12
votes
Accepted
Why does this shoreline change this way?
Short version; the beach moves because the waves change.
Long version; Beaches, and in fact entire bays, conform in shape and alignment to the prevailing wave patterns in the area. The exact magnitude ...
- 4,260
11
votes
Origin of Andaman and Nicobar islands
The Andaman and Nicobar Islands are neither orogenic or volcanic in origin. They are in fact an accretionary wedge, i.e., an accretion of sediments and oceanic crust "scraped" from the ...
- 7,729
10
votes
Accepted
Esker vs. Kame vs. Drumlin - what's the difference?
Eskers are glaciofluvial deposits from sediment carrying subglacial tunnels. As the water emerges from a tunnel at the bed of an ice sheet or glacier it will slow down. Since the sediment movement ...
- 5,014
9
votes
Accepted
Identifying a desert landform
Star dunes, caused by the prevailing winds coming from multiple directions.
Take a look at these different dune types.
- 6,878
9
votes
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Similarities and differences between lava flows and fluvial geomorphology (rivers)
The similarities pretty much end at the fact that both water and lava flow downhill seeking the lowest possible level. As even the most fluid lavas flow somewhat slower than water because of their ...
- 4,260
9
votes
What are these features on Eldon Hill?
These are marked up on the British Geological Survey's mapping as mineral veins cutting through the limestones, and in the associated memoir as sulphide ore veins. The surface expression that shows on ...
- 2,010
8
votes
Accepted
What do you call boulders of non sedimentary rock that were lithified into sandstone?
The technical term for a sedimentary rock that has a lithified fine-grained sediment with larger pieces of rocks suspended in it upon lithification is a conglomerate. The fine-grained interstitial ...
- 518
8
votes
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Could a massive flood have formed the Grand Canyon?
In addition to all of the above there are meanders inn the Grand Canyon which are hydraulic outcomes of 'minimum energy flow configurations'. This constrains the discharge rates that are possible - to ...
- 14.2k
8
votes
A circle shape in Madagascar
It is an extinct volcanic crater.
The location is not listed as one of the active volcanoes in Madagascar.
Simplified geologic map of Madagascar (reference) shows the crater to be mapped as basaltic /...
- 5,959
8
votes
Why are deserts mostly located on the western side of continents?
Because of the Coriolis Effect, the prevailing winds on the earth between about the Tropic of Capricorn and the Tropic of Cancer go from the East to the West (knows as the Trade Winds). To get to the ...
- 2,583
7
votes
Accepted
What causes jagged appearance of mountains in SE Asia?
David Hammen has already answered with the correct term in his comment.
Karsts are formed as water dissolve rocks, typically carbonates (as limestone or dolomite) or evaporites.
Karst landscapes ...
- 5,936
7
votes
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What causes these circular swirls of islands?
Near the Lake of the Woods, the island swirl or vortex is due to structures in bedrock beneath the lake. The rocks in this area are old and have been folded by tectonic action. The area has either ...
- 5,959
6
votes
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What causes such a narrow slit in a cliff? (see photo)
If you see the other user (Jan Doggen's) google maps link, you can see apparently similar features in different states - this is a particularly neat example of a general phenomenon.
These notches ...
- 141
6
votes
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What are 'articulate shells'?
If I remember correctly from my intro to paleo class, the terms articulate and inarticulate refer to a classification of brachiopods depending on the nature of their hinge. Articulate brachiopods have ...
- 947
6
votes
Are craters on Earth covered by vegetation?
No, there are nowhere near this many craters on earth.
I think you're asking if there are lots of craters on earth too, but they're hard to see because of vegetation and the oceans. The answer is 'no'...
- 11k
6
votes
Are craters on Earth covered by vegetation?
Without water there would be no multi-billion year history of plate tectonics, no glacial action, and no fluvial erosion, so the Earth would look unrecognizably primitive. But we have an atmosphere, ...
- 14.2k
6
votes
What separates the Karakoram Range, the Hindu Kush, and the Himalayan Range?
The River Indus in Jammu and Kashmir of India and Gilgit-Baltistan under Pakistan control is usually taken as the dividing line between Himalayas and Karakoram.
The River Gilgit, a tributary of the ...
6
votes
Accepted
How old are Chile's fjords?
The Quaternary is definitely a good guess. But it is difficult to answer your question because the "age of a fjord" is a rather ambiguous concept.
Also, I'll asume you are interested in the bedrock ...
- 17.6k
6
votes
Accepted
What causes these mound-like ground formations?
They're landslide deposits; Mam Tor gets its name, which translates as "mother hill", from the regular landslides that come off the higher slopes and form hillocks further down into the valley.
- 4,260
6
votes
How Could Sheep Graze these Steep Hillsides Without Leaving any Marks?
Those lines have nothing to do with animals.
Those lines are generated by solifluction and frost heave. It is sometimes referred to as cryoplanation or soil creep. Basically as the thin hillside soil ...
- 6,878
6
votes
Accepted
Geomorphological feature identification
The place is called Urðarháls. I could not find much information about it in the scientific literature... It is mentioned in Sigmarsson & Halldórsson (2015): they say it's an interglacial basaltic ...
- 7,729
Only top scored, non community-wiki answers of a minimum length are eligible