Question

which landform is part of the cryosphere? glacier lake ocean river

Explanation:

The cryosphere refers to the frozen water part of the Earth system. A glacier is a large mass of ice that moves slowly over land. Lakes, oceans, and rivers are mainly in liquid form (except in extremely cold conditions where they might freeze partially, but generally not considered as the main part of the cryosphere like glaciers which are solid ice masses).

Answer:

glacier