Answer:
Heat from the mantle forms convection currents causing the tectonic plates to diverge and form ocean basins.
Explanation:
Ocean basins form as a result of convection in the mantle along divergent margins.
- At a divergent margin, new crusts are being formed.
- It is said to be a constructive margin because new materials reaches through to the earth surface from there.
- The mantle convection pushes materials up and down away from heating centers and to cold regions and back and forth.
- This leads to the creation of cells which moves the overlying plate.
- The mantle materials are then able to reach the surface to form new ocean basin.
The unconformity that is found in a geological cross section indicates that in this area erosion happened.
Erosion is a natural process in which the surface of the Earth (<span><span>soil, rock, or dissolved material</span>) gets worn down.
The cause for erosion can be wind, water, glacier ice or other natural element.
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Answer:
the Andes is the primary mountain range in South America
