Continents Move To Current Positions (about 30 MYA)
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This is called The Continental Drift caused by convection currents in the Earths mantle.Plate tectonics is the
concept that the surface of the earth is composed of interlocking plates and that these plates move across the surface of the earth over time
concept that the surface of the earth is composed of interlocking plates and that these plates move across the surface of the earth over time
The Ice Age (about 10,000 YA)
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The Ice Age is also called The Glacier Age. Long periods of time with ice sheets and glaciers. About 1/3 of the earth was ice. The most recent ice age was almost 10,000 years ago. As the earth started warming up the ice started to melt. The last ice age left traces that it was there. It left GLACIERS!!! Sheets of ice covered valleys and rivers. Ice spread to different parts of the world. Scientists called it the ice age. It kept melting, then froze again. This went on for about a million years. About 10,000 years ago the earth started to warm up. Sheets of ice started to melt. As the ice melted it left lakes and broad valleys with a mixture of rocks and soil. The only ice left was up high in the mountains. The glaciers that you see now are what is left over from the ice age.