Metamorphic rock Metamorphic rocks are compacted by pressure and heat from deep inside the earth. Meteor A meteor is a meteoroid that has entered the Earth's atmosphere, usually making a fiery trail as it falls. It is sometimes called a shooting star. Most burn up before hitting the Earth. A meteorite is a meteor that has fallen to Earth.
Meteorites are either stone, iron, or stony-iron.
Meteoroid Meteoroids are tiny stones or pieces of metal that travel through space. Migration A migration is a seasonal journey from one region to another. Many whales migrate yearly from cold feeding waters to warm breeding waters. Gray whales make the longest cetacean migration. A million is a thousand thousand.