The Earth

Front

Of the four terrestrial planets, Earth is the _____

Back

largest

Front

Unlike the other three terrestrial planets, Earth has _____

Back

liquid water

Front

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

Back

iron and nickel

Front

What percentage of the radius of the Earth is comprised by the solid inner core?

Back

10%

Front

The outer core is mostly iron and nickel, but it’s _____

Back

liquid

Front

The consistency of the mantle is like _____

Back

very thick hot plastic

Front

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

Back

crust

Front

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

Back

plates

Front

Convection currents in the mantle cause warmer material to rise at a rate of a few _____

Back

centimeters per year

Front

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

Back

your fingernails grow