Question

1-) what process forms deep - sea trenches? (p382)

Explanation:

Deep - sea trenches are formed by the process of subduction. In plate tectonics, when an oceanic plate subducts (is forced under) another tectonic plate (usually a continental plate or another oceanic plate with more buoyancy), the downward movement of the denser oceanic plate creates a deep depression in the ocean floor, which is the deep - sea trench. This is a concept within the subfield of Geography (under Natural Science) as it pertains to the physical features and processes of the Earth's surface and interior related to plate tectonics and ocean floor formation.

Answer:

The process that forms deep - sea trenches is subduction (where an oceanic tectonic plate is forced beneath another plate, creating a deep depression in the ocean floor).