What do you call the green thing growing on rocky surfaces where a small amount of water is constantly flowing? - Quora

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Are there any plants out there that can grow on rocks? - Quora

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What do you call the green thing growing on rocky surfaces where a

How are oasis formed in a desert? - Quora

What planets are made of rock? - Quora

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Why does it seem that beaches up north or more rocky, while in the

What would happen to Las Vegas if Lake Mead began to run dry? - Quora

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How do they know what kind of environment a fossil was found in