Convection cells in earth's atmosphere form as a result of and earth's gravity.

a. earth's continents
b. earth's magnetic field
c. currents in earth's oceans
d. temperature differences on earth's surface

An empty fuel tank can still contain and therefore can be even more dangerous than one full of liquid fuel.

In the reaction between a crushed antacid tablet and vinegar what gas is emitted

Two people each hold the end of a rope and create waves by moving their arms up and down. this wave is best classified as a transverse wave because a) both the rope particles and the wave are moving in the same direction. b) the wave is moving up and down as the particles of the rope move horizontally. c) the wave is moving horizontally as the particles of the rope move up and down. eliminate d) the wave is moving in a parallel direction with the motion of the person's arms.