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Caves

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by

Olivia Mack

on 15 October 2013

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Transcript of Caves

Caves
How many caves are there on planet Earth?
There are millions of caves around the world. Tennessee alone has over 9,500 caves and Missouri has over 6,000.
What Kind of Caves Are There?
We have already learned about solution caves and how they are formed. But did you know there are also sea caves, lava caves, and glacier caves?
Sea Caves
Sea caves are formed by waves crashing against rocky coastlines or sea cliffs eroding the rock to form openings. Each wave can collide with the force of several hundred pounds per square inch creating unique entrances the sea caves.
Lava Caves
Lava caves are formed by flowing lava, which moves beneath the hardened surface of a lava flow. They can be extinct, which means the lava has cooled, forming a long tunnel. Lava can also still drain through it during an eruption, making it an active lava cave.
Active lava cave
Extinct lava cave
Glacier Caves
Most glacier caves are formed by water running through or under a glacier. Another way these caves are formed is by geothermal heat or hot springs located beneath the ice.
Solution Caves
When ground water sinks into the ground it combines with carbon dioxide to form a weak acid called carbonic acid
If there is limestone then a pocket will form in the rock creating caves
Stalactites and Stalamites
In this type of cave there are stalactites which are deposits of calcium left behind from a mix of carbonic acid and calcium from limestone
Stalagmites are build up of dripping
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