Early Earth

How did water arrive on early Earth?

• Meteors

• Clouds

• Dust

• Melting ice

Which term means living things arose from nonliving things

• biogenesis

• abiogenesis

• chemical evolution

• deep sea vent hypothesis

After water vapor condensed to form rain and then gradually accumulated, which of the following was formed?

• Earth's First Atmosphere
• Earth's Second Atmosphere
• Earth's Oceans
• Earth's Continents

In the earliest stages of Earth's development, our planet was made of what?

• Cotton Candy

• Molten rock

• Molten rock with a thin, hard crust

• Water

Earth does not have nearly as many craters as the Moon because:

• the Moon protected the Earth from many asteroid impacts.
• the Earth's magnetic field deflects incoming asteroids.
• many of the Earth's craters have eroded away.
• the Earth isn't as old as the Moon.

Which type of cell came first in geologic time?

• Eukaryotic

• Prokaryotic

• Plant

• Both Eukaryotic and Prokaryotic cells evolved around the same time

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.

The early atmosphere did NOT have which gas?

• Helium

• Carbon dioxide

• Hydrogen

• Oxygen

Scientists believe that Earth's core and crust formed after the materials pulled by Earth's gravity became very hot and ___________.

• Melted
• Broken

Which of the following is not an important part of Earth's second atmosphere?

• Helium
• Oxygen
• Water Vapor
• Carbon Dioxide