What is the average orbital speed of mars ?

How much of the united states’ electric generation comes from coal? a. about 25% b. about 50% c. about 75% d. about 90%

Find the coordinates of a if b(-9,-10) is the midpoint of ac and c has the coordinates of (-1,9)

Plzz on what physical process is responsible for the creation of volcanoes, earthquakes and ocean trenches at the plate margins?