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The Grand Canyon
Transcript of The Grand Canyon
Arizona. The great canyon was discovered by a group of people that no one knows. The amazing canyon has the Colorado River running through it. Many people visit the marvelous canyon every year. Surprisingly the Grand Canyon is younger than the rocks in it's walls. The canyon's layers are made up of sandstone, limestone, shale, and other sediment. Some of the rocks have been there for over two billion years!! They where there before the dinosaurs!! The Grand Canyon is also permeable. No one has ever fond a reptile skeleton or bone in the canyon!!
The Grand Canyon Report By: Marissa Dumais
The Grand Canyon started forming when the Pacific plate slid under the North American plate creating the rocky mountains. The Pacific and North American plates are pieces of land that move below the earth's surface. The rising of the North American plate created a plateau as it was moving up. Almost all scientist' s think that it took almost 4 million years for the canyon to form. The canyon itself was formed by the Colorado river eroding through the plateau. It started making a big river space where the canyon started to form. Water flow in the tributaries made the canyon wider. Once the water has gone through the side streams it goes back into the main part of the Colorado river. Erosion brings little pieces of rock down the river and then those little pieces build up to make little islands in the river, and weathering breaks down the rock so erosion can carry smaller pieces instead of big rocks.