Saturday, 15 August 2015

What is a sinkhole?

Sinkholes are so wierd!


What is a sinkhole?

A sinkhole is a hole in the ground formed when the rock underneath dissolves by groundwater.

Where do they form?

Sinkholes usually form in areas of chalk or limestone - types of rock slowly that dissolve with rain water.
Sinkhole collapses are pretty common in the American state of Florida. Virtually the whole of the state is a limestone platform.
But sinkholes are extremely rare in the UK.

What are they like?

Sinkholes can be of all different sizes ranging from just a few metres to large ones around 20 metres deep.
Collapsed sinkholes generally have steep rock sides and may have streams that then flow underground.

From CBBC Newsround

Watch the following compilation!

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