Earth's Spheres and Cycles

What does NOT produce carbon dioxide?

• Photosynthesis
• Burning Fossil Fuels
• Animal respiration
• Plants decaying

Organisms that do not decompose can be buried and become what?

• water
• nutrients
• air
• fossil fuels

Carbon can be found in...

• The atmosphere
• Soil
• Fossil fuels
• All of the above

Which of the following removes carbon from the atmosphere?

• Combustion
• Respiration
• Photosynthesis
• Death

Cellular respiration is the process by which organisms take in _____ and release _____.

• photosynthesis, air

• carbon, oxygen

• oxygen

• oxygen, carbon dioxide

The average temperature of the surface of Earth has increased approximately 1°C in the past century. Which reason best explains this increase in temperature?

• lower levels of ozone in the atmosphere
• lower levels of nitrogen in the atmosphere
• higher levels of carbon dioxide and other greenhouse gases in the atmosphere
• higher levels of oxygen in the atmosphere

How animals get the nitrogen they need

• from the air they breathe
• from the water they drink
• from the food they eat
• from the Sun

Organisms that need nitrogen to survive

• only plants
• only animals
• only bacteria
• all living organisms

Organisms that play a role in the nitrogen cycle

• only plants
• only animals
• only bacteria
• plants, animals, & bacteria

Nitrogen rich fertilizers and manure can cause water pollution.

• True
• False