The Carbon Life Cycle

When humans burn fossil fuels, most of the carbon quickly enters the as carbon dioxide.

• Water

• Sun

• Atmosphere

• Air

Which one of these does not add CO2 to the atmosphere?

• cooking with gas

• burning wood

• planting trees

• riding in a bus

Combustion is another word for _______________.

• a dog

• cutting down trees

• burning

• oxygen

What does not produce carbon dioxide?

• Photosynthesis

• Burning Fossil Fuels

• Plants decaying

• Animal respiration

The burning of fossil fuels adds CO2to the atmosphere. What is this process called?

• Consumption

• Diffusion

• Respiration

• Combustion

Which processes add CO2 to the atmosphere?

• Respiration

• Combustion

• Diffusion

• All of the above

How does the carbon in grass become part of a lion?

• The lion eats the grass

• The carbon ends up in the lion's food chain.

• Carbon from grass doesn't end up in a lion.

• The lion breathes in carbon given out by the plant

In what process is Carbon transformed into chemical energy?

• Photosynthesis

• Primary Production

• Respiration

• Secondary Production

The main human activity that releases greenhouse gases is

• eating meat

• texting on cellphones

• using bottled water

• burning fossil fuels

Things you can do to help decrease global warming include:

• Keep your freezer door open.

• Keep your air conditioner on high.

• Turn off your lights when you’re not using them.