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 The
fourth planet from the Sun is Mars. It is much smaller than the Earth,
but has many similar features. For example, its surface is marked with
deep craters, massive volcanoes, steep mountains, dusty deserts, and
huge valleys. The planet also has ice caps, like those found on Earth.
However, the temperature on Mars rarely rises above freezing and there
is no liquid water. This planet is named after the Roman god of war.
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on the inner planets.
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