Crash Course #11: The Earth

Unlike the other terrestrial planets, Earth has

• liquid water

• iron and nickel

• crust

• a core

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Earth's inner core is solid, and is made mostly of

• diamonds and rubies

• iron and cobalt

• iron and nickel

• nickel and copper

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What percentage of the radius of the Earth is comprised (made up of) by the solid inner core?

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The consistency of the mantle is like

• uranium

• very thick hot plastic

• solid metal

• molasses

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What is the name of the solid layer of rock, comprising Earth's outer surface?

• inner core

• outer core

• mantle

• crust

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Earth's crust isn't a completely solid piece; it's broken up into large

• plates

• cups

• saucers

• oceans

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The plates in the Earth's crust slide around at about the rate

• 100 miles a minute

• your fingernails grow

• your hair grows

• of light

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Which part of the Earth is about as hot as the surface of the sun?

• Ocean

• Crust

• Core

• Mantle

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Which element, deep inside the Earth, adds heat as it radioactively decays?

• Uranium

• Plutonium

• Kryptonite

• Radium

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Earth's magnetic field is mainly generated by

• convection of liquid in the crust

• convection of liquid in the outer core

• convection of liquid in the inner core

• convection of liquid in the mantle

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