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Earth Science Gr7

Chapter 21

TermDefinition
asteroid a small, rocky object that orbits the Sun
comet a small, rocky and icy object that orbits the Sun
astronomical unit the average distance from Earth to the Sun--about 150 million km
period of revolution the time it takes an object to travel once around the Sun
period of rotation the time it takes an object to complete one rotation
terrestrial planet Mercury, Venus, Earth, and Mars--the planets closest to the Sun that are made of rock and metallic minerals and have solid outer layers
greenhouse effect the natural process that occurs when certain gases in the atmosphere absorb and reradiate thermal energy from the Sun
Galilean moons the four largest of Jupiter's 63 moons discovered by Galileo
meteoroid a small, rocky particle that moves through space
meteor a meteoroid that has entered Earth's atmosphere and produces a streak of light
meteorite a meteoroid that that strikes a planet or a moon
impact crater a round depression formed on the surface of a planet, moon, or other space object by the impact of a meteorite
Created by: carriel
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