Question

question 16 which of the following best explains why earth is tectonically active? a earth’s solid surface layer rotates more rapidly than the layers beneath it. b areas of earth’s solid surface layer are under great pressure from ocean water. c earth’s solid surface layer sits on a layer of semimolten rock that slowly flows. d areas of earth’s solid surface layer are thicker and so heavier than other areas.

Explanation:

The Earth's tectonic activity is due to the movement of tectonic plates. These plates are part of the solid surface layer (lithosphere) which sits on the asthenosphere - a layer of semi - molten rock that slowly flows. This flow causes the plates to move, leading to tectonic activity such as earthquakes, volcanic eruptions, and mountain - building. Option A is incorrect as the surface layer does not rotate more rapidly than the layers beneath. Option B is about pressure from ocean water which is not the main cause of tectonic activity. Option D about the thickness and weight differences of the surface layer is not the primary reason for tectonic activity.

Answer:

C. Earth’s solid surface layer sits on a layer of semimolten rock that slowly flows.