What is it called when one plate sinks under another one?*1 pointRidge pushSubductionFocusEpicentre

Answer to the Question

The correct term for when one tectonic plate sinks beneath another is Subduction. Subduction occurs at convergent plate boundaries where an oceanic plate is forced down into the mantle beneath a second plate. This process contributes to geological activities such as earthquakes and volcanic eruptions.

Explanation of Other Options

1. Ridge push refers to the force that drives tectonic plates apart at mid-ocean ridges.
2. Focus is the point within the Earth where an earthquake originates.
3. Epicentre is the point on the Earth's surface directly above the focus of an earthquake.

Thus, the answer is Subduction.