Resources
| Factors Needed to Sustain Life | ||||||||||
| Earth has the perfect conditions to sustain life. These conditions include liquid water, a suitable temperature range that stays constant, and an atmosphere that gives us a mixture of gases to breathe in, burns up most meteoroids that come close to Earth, as well as absorbs harmful radiation from space. | ||||||||||
| Inner Planets | ||||||||||
The four planets that are closest to the sun are called the
terrestrial planets, or inner
planets. Mercury, Venus, Earth,
and Mars are all smaller planets that have rocky surfaces.
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| Outer Planets | ||||||||||
Jupiter, Saturn, Uranus, Neptune, and Pluto are called the outer
planets because they are the farthest from the sun. The first
four outer planets are called gas giants because they do not have
solid surfaces.
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Page created by Cami Lain. Last updated 4/15/2004