Which of these best explains why the asthenosphere is always in motion?

Cooling causes expansion and shifting of the fluid particles.

Cooling causes contraction and shifting of the fluid particles.

Heat makes the semi-fluid particles sink down and then rise up on cooling.

Heat makes the semi-fluid particles rise up and then come down on cooling.

Question

Quentin Aguilar

6 December, 11:55

+4

Answers (1)

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Roger Case · Answer 1

Heat makes the semi-fluid particles rise up and then come down on cooling. This causes convection currents wich moves the tectonic plates.