After high school, Katie goes on to join the Space Force as an astronaut. As she takes off on her first space shuttle launch, the exhaust gases are being emitted from the back of the engine. How does this help her take off into space?

Which process does not require the presence of a physical substance in order to transfer heat? air in the atmosphere is heated by the ground. this warm air then rises, and cooler air falls. this is an example of what type of process? how is conduction different from radiation?