Grand Canyon Rock Formations

1. What types of rocks are found in canyon?

1.1. NM: Sedimentary rocks

1.2. LC: There are Sedimentary rocks

1.3. DG: The Grand canyon is made of sedimentary rocks

2. When was the canyon formed?

2.1. NM:The roots of the Grand Canyon were formed 1.7 billion years ago.

2.2. LC: The Grand Canyon's rocks were formed More than 1.7 billion years ago.

2.3. DG: The grand canyons rocks are made of 1.7 billion year old rocks. That's one-third of the age of earth

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4. How was the canyon formed?

4.1. NM: Water and wind erosion over many years.

4.2. LC: Many years of wind and water erosion.

4.3. DG: The grand canyon was formed by years of erosion by water wind and also ice

5. Why does the canyon look the way it does?

5.1. NM: The Grand Canyon was once mountains and layers became eroded so it turned flat. But rock layers formed in different places.

5.2. LC: The Grand Canyon used to be mountains and around 60-70 million years ago as the Colorado River went through it started making the Grand Canyon.

5.3. DG: Where the grand canyon now is there used to mountain but they were eroded in to a level plain. After that the CO. river, wind and ice started forming a canyon.