Eruptions cause widespread destruction and death but are vital for our survival.
Powerful quakes strike near the Earth's plate boundaries.
Oceans cover about 71% of the Earth's surface.
The atmosphere protects our planet from radiation and asteroids.
The greenhouse effect saves Earth from an icy fate
Climate change has natural and manmade causes.
The Arctic is home to the second largest ice sheet on Earth.
Water is constantly moving around the planet.
Rocks are a valuable record of the Earth's history.
Large bodies of molten rock exist below the Earth's surface.
A giant impact may have formed the Moon.
Earth's many life forms are vunerable to its constant changes.
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