The term tsunami refers to which of the following?
a. a type of fault line
b. a way earthquakes can be measured
c. a huge ocean wave following an earthquake
d. a point inside earth's crust where an earthquake occurs

It's C.

Explanation:

A tsunami is a (large) wave that comes from the ocean onto land.

answer; /// i believe that one of the causes is (a loss of habitat);

reflecting point a across the origin negates both of its coordinates.

b = (5, -4)