PRECIPITATION,TEMPERATURE, VEGETATION
They began to form by a combination of volcanic activity and the deposit of marine sediments. It formed along northwest Africa about 530 million years ago. ... As the Appalachian Mountains eroded, sand and clay were deposited over Florida's limestone layer.
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The Red Terror was a period of the political repression and mass killings carried out by Bolsheviks after the beginning of the Russian Civil War in 1918.