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If scientists only detect p waves in a certain layer of earths interior what does that tell us?

Seasons are a result of: a.) earths rotation on its axis b.)earths tilt on its axis c.) global air circulation patterns d.) global humidity circulation patterns

What happens when heat from inside earth is transferred to its surface? warmer material is pushed to the crust more dense material is pushed to the crust warmer material is pushed to the outer core less dense material is pushed to the outer core