Environment C13 greenhouse gases

What are the two main greenhouse gases?

• oxygen and nitrogen
• sulfur dioxide and nitrogen dioxide
• carbon dioxide and methane
• water vapor and ozone

T/F: Water vapor is a greenhouse gas

• True
• False

The warming of the atmosphere by the trapping of heat being radiated to space is called

• evaporation
• condensation
• the greenhouse effect
• radiation

Without any greenhouse effect the Earth would be...

• Fine
• Too Cold to Support Life
• Very Hot

Over the past 200 years, the level of carbon dioxide in the atmosphere has

• decreased slightly.   
• increased until recently, and then decreased.
• increased steadily.   
• stayed about the same.

The main human activity that releases greenhouse gases is...

• using bottled water
• burning fossil fuels
• texting on cellphones
• eating meat

Melting of glaciers and polar ice caps....

• will result in cooler temperatures in the Arctic
• will result in sea-levels rising
• Will have no effect on ecosystems
• None of the above

1.  Certain gases in the atmosphere – water vapor, carbon dioxide, methane and nitrous oxide – help maintain the Earth’s temperatures and climate. These are called: __________ . 

• A.  ozone gases
• A.  solar gases
• A.  greenhouse gases 
• A.  stomach gases

Increased carbon dioxide may cause global warming by

• allowing more sunlight into the atmosphere.
• reflecting more sunlight from clouds.
• reducing the amount of oxygen in the air.   
• trapping more heat in the atmosphere.

"Greenhouse gases trap heat in the atmosphere."

The text describes the effect of greenhouse gases on the Earth. What effect do these gases have on the Earth?

• These gases cool the surface of the Earth and help it stay at a comfortable temperature

• These gases clean the surface of the Earth and lower the amount of pollution on the ground

• These gases freeze the surface of the Earth and help create icebergs in different parts of the ocean

• These gases warm the surface of the Earth and help it stay at a comfortable, warm average temperature