Earthquakes occur because (a) tectonic plates shift as Earth cools. (b) tectonic plates shift as Earth warms. (c) seismic waves escape Earth’s interior. (d) Pangaea continues to break up into smaller...

Earthquakes occur because

(a) tectonic plates shift as Earth cools.

(b) tectonic plates shift as Earth warms.

(c) seismic waves escape Earth’s interior.

(d) Pangaea continues to break up into smaller pieces.

Tsunami

(a) are usually caused by hurricanes.

(b) are usually caused by global warming.

(c) are usually caused by the Milankovitch cycles.

(d) are usually caused by earthquakes.