Scientists think the first atmosphere was formed by ......

• gases from volcanoes

• gases from animals

• gases from plants

• gases from the sea

What organisms do scientists think evolved first?

• Bacteria & algae

• Fish & grass

• Birds & trees

• Humans & animals

Tags

NGSS.HS-LS4-1

NGSS.HS-LS4-2

What process could algae carry out to make oxygen?

• Photosynthesis

• Respiration

• Digestion

• Phototropism

Tags

NGSS.HS-LS1-5

NGSS.HS-LS2-5

Why do scientists think there was no life on earth at first?

• There was not enough oxygen.

• There was not enough nitrogen.

• There was not enough carbon dioxide.

• There was not enough methane.

Tags

NGSS.HS-ESS1-6

As water vapour cools, what happens to it?

• It condenses and becomes a liquid.

• It evaporates and becomes a gas.

• It condenses and becomes a gas.

• It evaporates and becomes a liquid.

Tags

NGSS.MS-ESS2-4

NGSS.MS-PS1-4

NGSS.MS-PS3-4

The atmosphere today contains about ....

• 78% nitrogen and 21% oxygen

• 78% oxygen and 21% nitrogen

• 78% carbon dioxide and 21% oxygen

• 78% nitrogen and 21% carbon dioxide

When plants die and are buried, they formed what?

• In the absence of oxygen, crude oil

• In the presence of oxygen, coal

• In the presence of oxygen, crude oil

• In the absence of oxygen, coal

The early atmosphere contained a lot more water vapour than the modern atmosphere does. Where did it go?

• It condensed to form the oceans

• It escaped into space

• It was absorbed by plants

Tags

NGSS.HS-ESS1-6

NGSS.HS-ESS2-1

NGSS.HS-ESS2-5

What biochemical process absorbs carbon dioxide from the atmosphere and replaces it with oxygen?

• Photosynthesis

• Respiration

• Digestion

Tags

NGSS.HS-LS1-5

NGSS.HS-LS2-5

Which of the following is the correct word equation for photosynthesis?

• carbon dioxide + water →

  glucose + oxygen

• glucose → carbon dioxide + ethanol

• glucose + oxygen → carbon dioxide + water