What is likely happening at the boundary between the nazca plate and the pacific plate?

Divergent plate motion

Explanation:

The Nazca plate represents the eastern side of the great Pacific ocean. It is separating from the Pacific thereby moving further eastward colliding with the South American plate, forming the Andes mountains. During its motion, it has moved over many mantle plumes as a result of which volcanoes were formed.

But, Nazca and Pacific plate shares a divergent plate boundary, separating the two plates, marked by the presence of a mid oceanic ridge. In addition to this, it also shares transform plate boundary at some places along the mid oceanic ridge. The deep focus earthquakes are generated in and around this region.

freezing

deposition

condensation

explanation;

melting also called fusion is the process where solid becomes liquid, sublimation is the process where solid becomes gaseous without first changing to liquid, deposition involves change from gaseous to solid state, freezing involves change from liquid to solid, boiling or evaporation involves change of liquid to gaseous state, while condensation is the change from gaseous state to liquid state.

endothermic reactions involves absorption of heat from the surroundings or the environment while exothermic reactions involves loss of heat energy to the surroundings.

in this case, sublimation, evaporation and melting are endothermic reactions (gain energy from the environment) while, freezing, deposition and condensation are exothermic (loss of energy to the surroundings) reactions.