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Chapter21vocabwords

TermDefinition
Asteroids This term is telling us that this orbits the sun belt between the orbits of Mars and Jupiter.
Comet is made of gas,dust, and ice and moves around the sun in an oval-shaped orbit
Astronomical unit is the average distance from Earth to the sun - about 150 million km
periods of revolution Is the time it takes an object to travel once around the sun is called
Periods of rotation The time it takes an object to complete one rotation is called
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 are the four largest moons of Jupiter -Io, Europa,Ganymede,and callisto-are known as the
Meteoroid is a small,rocky particle that moves sand .
Meteor is a meteoroid that has entered Earth's atmosphere,producing a streak of light
meteorite is a meteoroid that strikes a planet or a moon.
impact crater is around depression formed on the surface of a planet.
Created by: avileliz
 

 



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