Gradualism emphasizes slow changes on Earth over long periods of time, while catastrophism emphasizes change through natural disasters.
Answer:
a. The convective circulation in the upper mantle
Explanation:
The engine that powers plate movement is the formation of convective cells within the mantle.
Convection is a heat transfer method usually that occurs within fluids.
The internal heat engine provides a source of temperature that makes part of the mantle to occur in a weak molten form. This is the asthenosphere. Overriding the layer is the lithosphere.
Convection allows for dense and cold lithospheric plate to sink into the asthenosphere and the hot, buoyant asthenosphere rises to the surface to replace it. The alternation between these processes results in mantle convection and eventual plate movement.
The correct answer is All of the above. While rice has a submerged growth state, most weeds, and pests do not. Flooding the fields causes the soil to degrade so weeds cannot take root. <span>Residual herbicides and pesticides from previous seasons dissolve in the water.
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El Nino happens about every two to seven years. The closest answer here would be D., about every three to seven years
