The Earth Takes Shape

Approximately what percentage of the Earth's surface is covered with water?

• less than 25%

• about 60%

• more than 70%

• more than 90%

Tags

NGSS.MS-ESS2-4

Why was early Earth so hot?

Tags

NGSS.HS-ESS1-6

When Earth was a ball of magma, the dense iron & nickel sank to Earth’s center to form the

• crust

• mantle

• core

The layer of Earth beneath the crust is called the

• crust

• mantle

• core

Today, most of Earth’s atmosphere is made up of _______ & _______

• carbon dioxide and helium

• nitrogen and helium

• carbon dioxide and oxygen

• nitrogen and oxygen

True or False: Some of the water in Earth's oceans may have come from water vapor released by volcanoes.

• True

• False

As Earth’s early atmosphere changed, it probably formed from

• meteoroids

• hot springs

• crystal rock

• volcanic gases

True or False: Earth may have been a giant ocean with no continents for the first few hundred million years of its existence.

• True

• False

Tags

NGSS.HS-ESS1-6

What happened to the heavier elements as the rock melts?

• they rise to the surface

• the sink to the center

• they evaporate

• I don't know

Tags

NGSS.MS-ESS2-1

How long ago did the continents first start to 'grow'?

• 4.5 billion years ago

• 2.5 billion years ago

• 2.5 million years ago

• 1.5 billion years ago

Tags

NGSS.MS-ESS2-3