The answer to
this is b , your welcome
Where, I'm unsure, but when, I think I know. There is a theory that the first asteroid to hit Earth was actually a comet. It wiped out the dinosaurs.
The sedimentary rock cycle. This is when a lot of rocks are being pushed and pressed together.
Gravitation between two objects increases when the distance between them decreases.
When the mass of an object increases, its gravitational pull also increases.
