Q: Fact: gravity causes substances to be pulled down on a planet
Question: What does gravity cause substances on a planet?

A: things to descend to the lowest surface possible

Q: Fact: as state of matter changes , mass will not change
Question: When a water balloon is frozen, it will contain

A: the same amount of water

Q: Fact: sonar is used to find the location of an object
Question: How do bats avoid crashing into trees while flying around at night?

A: they bounce their screams off of things

Q: Fact: the circulatory system brings oxygen from the lungs to the rest of the body
Question: The circulatory system is so long it

A:
could be wrapped around the earth