The correct answer is :
From the cross section of the Grand Canyon, present is the Uplift, erosion deposition and tilting of the Precambrian sedimentary and igneous rocks.
The Precambrian metamorphic rocks and granite are the oldest rocks or structures.
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The sahara made migrating rough because it was a desert but it was easier to pass through rather than south afria going through jungles
1) by making certain goods and services available
2) by creating advertisements
3) and by knowing what a consumers wants
