Seasonal variations in Earth's climate are caused by

The earth orbiting around the sun.

Explanation:

Before reading this explanation please bare in mind that the earth's axises are tilted and not in one straight line. Now as the earth orbits around the sun it is subjected to different angles each and everytime these different angles result in different amounts of sunlight striking the earth therefore the temepratures will differ changing the cimate and these changes are seasonal, we have four of them and they are known as our four seasons

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explanation:

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.