Answer:
A flood is when a bunch of water comes rushing into a place and everything is almost completely covered in water. A landslide is much the same except it is with land-not water.
Explanation:
Tourism is the LARGEST industry in the world.
Answer:
If a spacecraft is in space for a long time, radiation is a problem. Designers must figure out a way to protect astronauts from the radiation.
Air mass, letter a is the correct one
