Limestone is a type of rock is especially likely to form caves. The inside of a cave is usually made of
stalagmites<span>
and </span><span>
stalactites.
The picture below is limestone. That's the rock used to form caves.
Hope that helps! -UF aka Nadia</span>
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In the late 1800s, people in many parts of the world decided to leave their homes and immigrate to the United States. Fleeing crop failure, land and job shortages, rising taxes, and famine, many came to the U. S. because it was perceived as the land of economic opportunity.