Why is it hot underground?

What did miners notice as they dug deeper into the Earth?

• It became colder

• It became toastier

• There was no change in temperature

• They found more gold

Who had a theory about the Earth's temperature?

• Albert Einstein

• Isaac Newton

• Lord Kelvin

• Charles Darwin

Tags

NGSS.MS-ESS2-6

NGSS.MS-ESS3-5

What was Lord Kelvin's estimate of the Earth's age?

• 4.5 million years

• 20 million years

• 4.5 thousand million years

• 1 billion years

What factor did Kelvin overlook that contributed to his error?

• The Earth's crust

• Radioactivity

• The planet's rotation

• The atmosphere

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NGSS.HS-ESS1-6

What happens to the rock closest to the molten outer core?

• It becomes solid

• It becomes more pliable

• It cools down quickly

• It turns into lava

How does heat move through the Earth's layers?

• By conduction only

• By radiation only

• Through convection currents

• By evaporation

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NGSS.MS-PS1-4

What does the stirring of warm rock help fuel?

• Earthquakes

• Volcanoes

• Meteor showers

• Tidal waves

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NGSS.MS-ESS2-1

What is the primary reason the Earth is still warm today?

• The sunlight

• The heat from the core

• The cooling of the atmosphere

• The oceans

Tags

NGSS.MS-ESS3-5