review chapter 3

when was the solar system formed

• 5 billion years ago

• 2014

• 1999

• 2876

when were ocean began forming

• 3240

• 5000 years ago

• 4.2 million years ago

• 2000

how much ocean covers the earth

• 71 %

• 43%

• 12%

• 25%

primitive compostion

• guitar

• Silicon compounds, iron, magnesium oxide

• water earth

• fire air

earth first layer

• mantle

• crust

earth second layer

• crust

• mantle

earth third layer

• core

• mantle

• crust

• gravel

What is the hottest layer of the Earth?

• Crust

• Mantle

• Outer Core

• Inner Core

What gas is most abundant in the Earth's atmosphere?

• Oxygen

• Carbon Dioxide

• Nitrogen

• Hydrogen

Which layer of the Earth lies directly beneath the crust?

• Core

• Mantle

• Lithosphere

• Asthenosphere