Questions tagged [cavern]

The tag has no usage guidance.

Filter by
Sorted by
Tagged with
0
votes
1answer
47 views

Possible cavern?

In eastern Ontario, Canada, there's a place where, when walking and stomping, you can hear a hollowness in the ground. The area is primarily igneous rock with many large boulders, and the spot in ...
0
votes
2answers
138 views

Sea cave vs Sea arch

How do you distinguish sea cave from sea arch? If I want to classify a crack of sea cliff as sea cave, has it to have a dead end? Would you call a geological formation as a sea cave even a kayak can ...
3
votes
1answer
147 views

What kind of lava tube feature is Cleopatra's Grave?

Cleopatra's Grave is a natural feature inside (warning: PDF) Catacombs Cave in Lava Beds National Monument near Modoc, California. Source: LookBeforeYouLive My apologies, as this image is somehow in ...
9
votes
2answers
160 views

Why are there no deep caves in the continental US?

According to http://www.caverbob.com/wdeep.htm and http://www.caverbob.com/usadeep.htm, the only cave over 1000m deep in the US is a lava cave in Hawaii. In the continental US the deepest is 505m. On ...
2
votes
1answer
415 views

How are Benagil caves formed?

The Benagil caves are really impressive. How are they formed though? What makes that perfect domed shape and how is that hole in the ceiling created?
19
votes
4answers
8k views

What is the deepest we have ever gone into the Earth?

I remember Journey to the Center of Earth and wonder: What is the deepest in the Earth surface or below sea level we have traveled either by foot, sub, drill or camera?