What are two examples of things studied in the earth sciences?

two examples of things studied in the earth sciences are rocks and landscape features.

Explanation:

there's actually A LOT you can learn in earth science, so rocks and landscape features are just two examples. if you want even more specific examples, there's igneous rocks and sedimentary rocks, and there's also landscape features like glaciers and eolian systems (both of these you can find naturally on the earth).

i used to know but i learned it a long time ago sorry

explanation:

an expansion is one of two basic business cycle phases; the other is contraction. the transition from expansion to contraction is a peak, and the changeover from contraction to expansion is a trough.