Early Earth

Earth started out as a...

• Molten rock planet

• Planet with water

• Protoplanet

• Moon

How did water arrive on early Earth?

• Meteors

• Clouds

• Dust

• Melting ice

Tags

NGSS.HS-ESS1-6

Pictured is zircon. It has been dated to 4.4 billion years old. This is evidence for which event in Earth's history?

• The Earth was formed over 4.4 billion years ago.

• The moon was formed by a protoplanet crashing into Earth.

• Water arrives on Earth and forms the oceans.

• The early atmosphere had lots of carbon dioxide, hydrogen, and helium.

Tags

NGSS.HS-ESS1-6

The early atmosphere did NOT have which gas?

• Helium

• Carbon dioxide

• Hydrogen

• Oxygen

In which Eon did Earth have hellish condtions?

• Phanerozoic

• Prototerozoic

• Archean

• Hadean

What is the estimated age of the Earth according to modern studies?

• 5 billion years

• 3.8 billion years

• 4.2 billion years

• 4.567 billion years

Tags

NGSS.HS-ESS1-6

Which of the following would NOT be a reason why scientists think life didn't start on land?

• The first crust was covered in glaciers

• The atmosphere was filled with harmful chemicals

• The ultraviolet radiation would destroy organic compounds

• The chemicals necessary for life are plentiful in certain parts of the ocean

Why did heavy metals like iron and nickel get pushed to Earth's center during the formation of Earth's layers?

• They are heavy.

• Gravity

• The Sun

• There weren't lighter metals at the time.

Tags

NGSS.MS-ESS2-1

What is the first form of life on Earth?

• Humans

• Plants

• Fungi

• Protocells

Why were the tides so much taller on early Earth?

• There was more water.

• We had more oceans.

• The moon was closer.

• The moon was farther.