Cumulonimbus clouds are formed by().
A、vertical air movements
B、heavy rainstorms
C、horizontal air movements
D、any movement of moist air
A、vertical air movements
B、heavy rainstorms
C、horizontal air movements
D、any movement of moist air
A、A.vertical air movements B、B.heavy rainstorms C、C.horizontal air movements D、D.any movement of moist air