Evolution of the atmosphere

The current atmosphere is composed of mainly?

• Oxygen
• Argon
• Carbon dioxide
• Nitrogen

Oxygen is the most common gas in the current atmosphere.

• True
• False
• Both True and False
• Neither True nor False

Within the current atmosphere, what gas is 21%?

• nitrogen
• oxygen
• argon
• flatulence

What produced oxygen within the early stages of our atmosphere?

• Plants

• Volcanos

• Galactic Debris

• cyanobacteria

The early atmosphere, volcanoes appeared and released __________, ________ and _____________.

• water, nitrogen and oxygen

• carbon dioxide, Sulphur and nitrogen

• nitrogen, carbon dioxide and water vapour

• Helium and carbon dioxide

The first plant was ______________.

• kelp
• seaweed
• blue-green algae
• pine tree

In order for the oceans to form on Earth, what had to happen?

• Earth had to heat up and water had to evaporate

• Earth had to remain constant temperature

• More Volcanoes had to erupt

• Earth's surface had to cool down and allowed condensation to occur

What percentage of our atmosphere is made up of other gases such as argon, water vapor, and carbon dioxide (called trace gases)?

• 1%

• 21%

• 78%

• 90%

Scientists hypothesize that _________ put oxygen in to the atmosphere due to the evidence of banded iron formations ("red rock" bands).

• photosynthesis by algae

• outgasing by volcanoes

• comets

This gas was in high concentrations in the early atmosphere, and later condensed to form Earth's oceans. 

• oxygen
• carbon dioxide
• sulfur oxides
• water vapor