The movement of fluid as a result of differential heating or convection. Earth convection currents refer to the motion of molten rock in the mantle as radioactive decay heats up magma, causing it to rise and driving the global scale flow of magma.
It starts or speeds up.
Some substances need certain amount of energy in order to react with each other.
not enough information is given to determine the velocity of the object at time to=0.00s
