Atmosphere Layers and Composition

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What do greenhouse gases do in the troposphere?

• They trap heat radiating from the Earth
• They block solar radiation from reaching the Earth
• They shield the planet from dangerous solar winds
• They absorb dangerous UV Rays from the sun
• All of the above

Which of the following are greenhouse gases in the atmosphere?

• Nitrogen

• Methane

• Water Vapor

• All are trace gases in the atmosphere

• Methane and Water Vapor only

What is the most common gas in the atmosphere?

• Oxygen
• Carbon Dioxide
• Water Vapor
• Nitrogen

Oxygen is what percent of the atmosphere

• less than .1%
• 21%
• 42%
• 78%

When was the concentration of carbon dioxide the greatest?

• During the Ice Age
• In 1750
• In 2020
• Greenhouse gases have remained steady through all of these time periods

Air pressure is

• the force that air molecules push up from the surface.
• not present at the equator.
• the force that air molecules push down on a surface.
• not present at sea level

Where is the pressure the lowest?

• at Figure A.
• at Figure B.
• at Figure C.

Where is the air pressure highest?

• Point A
• Point B
• Point C
• Sea Level

At what altitude has air pressure dropped 50% from sea level pressure? (use the chart above)

• 5 km
• 10 km
• 15 km
• 20 km