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Chapter 21 Vocab

Vocabulary

TermDefinition
asteroids millions of small,rocky objects that orbit in the asteroid belt between the orbits of Mars and Jupiter.
comet is a made of gas,dust,and ice and moves around the sun in an oval-shaped orbit.
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 planets are the planets closest to the sun are made of rock and metal and have solid outer layers.
greenhouse effect occurs when a planets atmosphere traps solar energy and causes the surface temperature to increase.
Galilean moons the four largest moons of jupiter-lo,europa,Ganymede,and Callisto .
meteroid is a small rocky particle that moves through space.
meteor is a meteoroid that has entered earths atmosphere producing a streak of light.
meteorite is a meteoroid that strikes a planet or moon.
impact Crater is a round depression formed on the surface of a planet,moon,of impact of a meteorite.
astronomical unit is the average distance from earth to the sun-about 150 million km.
Created by: kailanih
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