What force makes cold water sink toward the ocean floor? a. global winds c. gravity b. the sun d. the coriolis effect
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Gravity makes cold water sink toward the ocean floor. 

The force that makes cold water sink toward the ocean floor is gravity. Because cold water has a higher density , which means that it will be heavier.

Magma forms by partial melting of upper mantle and crust. partial melt means that only a fraction of the available material forms a melt, and that the remainder stays solid. the partial melt rises because of its lower density and ascends through he crust. this is so conclusive mean the answer would be magma igneous rocks or balistic magma.