DICTIONARY LOOKUP
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The Red Planet
Mars is a cold desert world. It is half the diameter of Earth and has the same amount of dry land. Like Earth, Mars has seasons, polar ice caps, volcanoes, canyons and weather, but its atmosphere is too thin for liquid water to exist for long on the surface. There are signs of ancient floods on Mars, but evidence for water now exists mainly in icy soil and thin clouds.

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Watt

A unit of power, equivalent to one joule of energy per second.

wavelength

The distance between successive crests or troughs in a wave.

weathering

The chemical and physical alteration of materials exposed to the environment on or near the surface of a planetary body.

 
Can't find it? Don't understand it? Ask us.
Q
Watt

A unit of power, equivalent to one joule of energy per second.

wavelength

The distance between successive crests or troughs in a wave.

weathering

The chemical and physical alteration of materials exposed to the environment on or near the surface of a planetary body.