Earth's lithospheric plates
A.
move only up and down.
B.
move only once.
C.
do not move.
D.
are constantly in motion.

The answer is - D. are constantly in motion

These plates move back and forth and sometimes even end up going one above other

indicate valleys, hills, steepness and gentleness of slopes.

explanation:

contour lines on a map indicate elevation, or depth. numeric notations on contour lines refer to the level of elevation, or height about sea level.

sorry i was late, but i don't know what assignment your talking about, i'm in flvs as well, im in earth space science. but u are behind pace bc every class should be in the 3's or 4'