Complete the following paragraph:
(Words given: chemical reactions, upward, downward, burns, compressed, fuel)
Launching of a rocket is based on Newton's laws of motion. When the ......... in the rocket is ignited, it ......... as a result of ......... and the ......... hot gases are thrown out with a tremendous force in the ......... direction, through a small opening in the tail of the rocket. At the same time, the escaping gases exert an equal (in magnitude) and opposite (in direction force of reaction on the rocket in the......... direction. As this force is greater than the net downward force (in magnitude) due to gravity and air resistance, the velocity of the rocket increases as it moves upward.