Climatologists study ocean currents because they play a major role in global climate.

with which two parts of the earth system is a climatologist involved?

a. atmosphere and magnetosphere

b. atmosphere and hydrosphere

c. hydrosphere and biosphere

d. atmosphere and lithosphere

I think  the correct answer from the choices listed above is option B. It is the atmosphere and the hydrosphere the two parts of the Earth system that a climatologist is involved. Hydrosphere is the oceans and other water bodies. While, the atmosphere plays a major role in the cycle of water here on Earth. So, the two goes together.

The answer is c) people evacuated but almost all returned

The sun's parallax would be 180 degrees, greater than which you can't get.  so a. would be your anwser