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use this video as reference: http://magma.nationalgeographic.com/ngexplorer/0603/quickflicks/

The Earth's Inner Core

is at the very center of the earth

Iron

is the element that makes up most of the Earth's inner core

The earth is approximately how old?

5 billion years

Earthquakes

are caused by plate movement

Picture of the earth's core

Earth's Crust

is made up mostly of rock

The center of the earth

is about 4000 miles below the surface

Earth's outer core

is made of liquid metal

Geophysicists

study earth's structure and development

Jupiter

is the most massive planet

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