History of Earth's Atmosphere

When the Earth was first forming, it did not have an atmosphere.

• True

• False

What was Earth's first atmosphere made of?

• Oxygen and Carbon Dioxide

• Hydrogen and oxygen

• Nitrogen and ammonia

• Hydrogen and Helium

Nitrogen, carbon dioxide, ammonia, sulfur dioxide, methane, and water vapor made up the secondary atmosphere. Where did these gases come from?

• The Sun

• Volcanoes and Comets

• Outer Space

• Volcanoes

The most important components of the second atmosphere were

• hydrogen and helium

• methane and ammonia

• carbon dioxide, water, nitrogen

• water and oxygen

Where did the water on Earth come from?

• Half came from the interior of the Earth; the second half came from outer space (comets)

• The water came from the gases in the atmosphere as the Earth cooled.

• The Mars-sized planet that hit the Earth.

• The water came from the early plant life

Tags

NGSS.HS-ESS1-6

The first primitive life that formed in the oceans was

• primitive land plants

• blue-green algae and photosynthetic bacteria

• primitive animal life

• fish

The blue-green algae and photosynthetic bacteria created

• carbon dioxide

• nitrogen

• water

• oxygen

Tags

NGSS.MS-LS1-6

_______ began to decrease in the atmosphere because plants were absorbing carbon.

• oxygen

• nitrogen

• carbon dioxide

• water

Tags

NGSS.MS-LS1-6

NGSS.MS-LS2-3

What is ozone?

• A molecule made up of two oxygen atoms and one nitrogen atom

• A molecule made up of three oxygen atoms

• A molecule made of two hydrogen atoms and one oxygen atom

• A molecule made up of two oxygen atoms

Tags

NGSS.MS-PS1-1

Why is the presence of ozone in the atmosphere important

• It keeps oxygen from escaping into outer space

• To keep water vapor in the atmosphere

• It keeps the Earth's surface warm

• It absorbs harmful ultraviolet rays from the sun