Nat Geo History of Earth

How old is Earth?

• 6,000 years old

• 4.5 million years old

• 4.5 billion years old

• 1 million years old

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How did the moon form?

• A chunk of Mars got trapped in Earth's orbit.

• Another new planet collided with Earth. The debris from the collision formed the moon.

• Tillamook Cheese Company fired the giant ball of cheddar into orbit.

• An asteroid was caught in orbit around Earth

According to the video, how did water end up on Earth?

• Water came from meteors that rained down on Earth about 3.9 BYA

• Water came from the collision that formed the moon.

• Water was trapped in sedimentary rock layers.

• There is no water on Earth.

Did early Earth have oxygen?

• Yes

• No

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What were the first organisms on Earth?

• Dogs

• Humans

• Unicorns

• Single-celled bacteria

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What is true about stromatolites? Choose all that apply.

• They are made of colonies of bacteria

• The bacteria that make up stromatolites are photosynthetic (like plants they get energy from sunlight).

• Stromatolites give off oxygen.

• They were one of the first multicellular organisms on Earth.

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What was the first supercontinent called?

• Rodinia

• Pangaea

• Laurasia

• Gondwana

What forces causes tectonic plates to move?

• The rotation of Earth on its axis.

• Volcanic activity.

• Convection (heat) currents in the mantle.

• Evolution.

What caused the first Ice Age "Snowball Earth" 650 million years ago?

• Very low levels of carbon dioxide (CO₂₎in the atmosphere.

• Very high levels of carbon dioxide (CO₂₎ in the atmosphere.

• The Yeti

• Emperor Palpatine's cold heart.

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Have days on Earth always been 24 hours?

• Yes

• No