global warming definition. The term attached to the notion that the Earth's temperature is increasing due to the greenhouse effect. Note: Whether global warming is actually happening is a subject of scientific debate.
Like jet airplanes, space rockets work on a principle called action and reaction (another name for Newton's third law of motion). The massive force (action) generated by hot gases firing backward from a rocket's engines produces an equal force (reaction) that pushes the rocket forward through space.
2. What happens during the apparent retrograde motion of a planet? a) the planet rises in the west and sets in the east. b) the planet appears to move westward with respect to the stars over a period of many nights. c) the planet moves backward through the sky. d) the planet moves backward in its orbit around the Sun