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Can You Answer These Basic Questions About Earth?

You know you learned this stuff at least once. Can you remember it now?

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  1. New Line Cinema
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    Earth is the densest!

    It has an average density of 5.51 grams per cubic centimeter.

  2. Tap to play GIF Tap to play GIF
    Tiger Productions / Via youtube.com
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    It's spreading apart!

    Thanks to the Mid Ocean Ridge right in the middle of the Atlantic Ocean basin, the ocean floor is spreading apart at a rate of about 2 to 5 cm per year.

  3. NASA
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    Other places have volcanoes too!

    There's a whole bunch on Jupiter's moon Io, for example.

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    Purin Kumagai / Via youtube.com
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    Probably not!

    Scientists once thought that was possible, but now they can't really see a way for that to have happened. Now most scientists think it is the result of a massive collision with a Mars-sized object.

  5. prescott09 / Thinkstock
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    Truth!

    Nitrogen gas makes up well over 70% of the atmosphere

  6. Chuang Zhao
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    False!

    There was an even bigger one 250 million years ago!

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    National Geographic / Via youtube.com
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    True!

    They happen on Earth but they are caused by the Sun!

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    desertsmurf / Via youtube.com
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    Oxygen came later!

    The oxygen in our atmosphere came after photosynthesis first evolved around 2.4 billion years ago.

  9. egal / Thinkstock
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    Sometimes it's more circular than other times!

    The "eccentricity" of Earth's orbit, how circular or elliptical it is, varies on a roughly 100,000 year cycle.

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    Universal Pictures
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    Totally true!

    The world was a pretty warm place 55 million years ago.

Science Writer, Fossil Beastmaster

Contact Alex Kasprak at alex.kasprak@buzzfeed.com.

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