Amajor concern about increasing global temperatures is that a large portion of polar ice could detach and melt into the ocean. if this would happen, which two spheres would directly interact? a cryosphere and atmosphere b cryosphere and hydrosphere c cryosphere and biosphere d cryosphere and geosphere i think its either a or b ? ?

The correct answer is - B. cryosphere and hydrosphere.

The cryosphere represents all the frozen water masses on the Earth.

The hydrosphere represents all the liquid water masses on the Earth.

Since the polar ice is a frozen water mass it falls into the cryosphere, and the ocean waters are liquid and it falls into the hydrosphere, with the melting of the polar ice and becoming liquid water into the oceans, we have an interaction between parts of the cryosphere and hydrosphere.