Q: Fact: most animals avoid bad odors
Question: A skunk wards off predators with

A: a noxious spray

Q: Fact: the slope of the land causes a river to flow in a particular direction
Question: If a river is flowing down the east side of a hill, then the hill

A: drops sharply right there

Q: Fact: the sun is the source of energy for physical cycles on Earth
Question: What is the source of energy for physical cycles on Earth?

A: the closest yellow dwarf star

Q: Fact: when a sound is produced inside of a room , there is sometimes an echo after the sound
Question: When a sound is produced inside a room, sometimes there is a

A:
delayed reflection