Air circulates in Earth's atmosphere. Which of the following is the fundamental cause of air circulation in Earth's atmosphere?
A. O ocean currents
B. O Earth's gravity
C. o Earth's magnetic field
D. O temperature differences

Explanation:

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igneous rocks which formed by the crystallization of magma at the surface of the earth called extrusive rocks. they are characterized by fine-grained textures because the rapid cooling at or near the surface did not provide enough time for large crystals to grow.