soil

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Does the sun rotate on its own axis?

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If humans go extinct, how long will it take for all evidence of our existence to disappear?

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All the planets revolve in orbit, but what is their motive, what propels them forward at that speed?

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If you search long enough, will you find fossils in every layer of sedimentary rock?

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What is this (rock)?

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Do other solar systems exist?

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How does a solar system form?

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When one travels into space, time on earth moves faster than that of travelers, is this also the case when one travels from mars...