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The Colorado River.
The Grand Canyon was formed by the Colorado River wearing away at the rock over a long period of time. Some estimate in the millions of years.
The Grand Canyon was formed by the Colorado River wearing away at the rock over a long period of time. Some estimate in the millions of years. +++ "was formed". It is still being formed as it still carries the R. Colorado and its tributaries.
sedimentary rock
The Grand Canyon was formed by the Colorado River wearing away at the rock over a long period of time. Some estimate in the millions of years.
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Around the same period of time.
1. Over long period of time
index fossils
Gypsum is a mineral that was formed by layers of sediment , fine particles, that were deposited over a period of time, and then subjected to geologic forces.
Over a long period of time, the rock erodes into sediments. These sediments, along with pressure and water, form sedimentary rocks.
About 17 million years ago.