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.

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