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15
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What was water like on Earth at first?
It was water vapor because it was too hot for liquid water
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How old do scientists think Earth is?
About 4.6 billion years old
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Aside from respiration, why was the addition of oxygen to the atmosphere through photosynthesis important?
It created an ozone layer that blocks ultraviolet rays from the sun
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What happened to denser materials on Earth?
They sank towards the center and formed Earth's dense, iron core
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How do scientists think Earth formed?
It began as a ball of dust, rock, and ice in space that was pulled together by gravity
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How long ago did photosynthesis develop?
About 2.5 billion years ago
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monster
Reset all scores!
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fairy
Take points!
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25
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gift
Win 25 points!
Okay!
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baam
Lose 5 points!
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What was the temperature like on the newly formed Earth?
It was so hot that scientists think Earth might have melted
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baam
Lose 15 points!
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gift
Win 25 points!
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shark
Other team loses 25 points!
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banana
Go to last place!
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How did Earth's second atmosphere form?
Volcanic eruptions and collisions with comets added carbon dioxide, water vapor, nitrogen, and other gases to the atmosphere.
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seesaw
Swap points!
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rocket
Go to first place!
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shark
Other team loses 25 points!
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banana
Go to last place!
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15
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How old are the oldest rocks on Earth?
About 4 billion years old
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How old are the oldest moon rocks?
About 4.6 billion years old
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How old are the single-celled organisms scientists found in rocks?
About 3.5 billion years old
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15
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What happened to less dense materials on Earth?
Molten material hardened over time and formed Earth's outer layers
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15
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When did continents form?
Less than 500 million years after Earth formed
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