Answer the following question given this paragraph: 

Earthquakes also occur at divergent plate boundaries. At mid-ocean ridges, these earthquakes tend to be small and shallow focus because the plates are thin, young, and hot. Earthquakes in the oceans are usually far from land, so they have little effect on peoples’ lives. On land, where continents are rifting apart, earthquakes are larger and stronger.


Q: What causes earthquakes at mid-ocean ridges to be small and shallow?

 Choices:

- plates are thin , young , and cold

- plates are thick , young , and cold

- plates are thick , old , and hot

- plates are thin , young , and hot

A:
plates are thin , young , and hot
