This Interactive helps explain why Earth can retain a life-sustaining atmosphere with oxygen, but Mars cannot. Zenith hourly rate – Meteorites expected to be viewed per hour during a meteor shower, where the meteor showers radiance is at an observer’s zenith. North Celestial Pole – the point in the sky to which Earth’s Geographical North Pole points. By studying volcanism and plate tectonics, we gain knowledge of how volcanoes and land mass motions occur elsewhere. Tremolite – Common mineral in metamorphic rocks, made up mainly of calcium and magnesium.

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