The Carbon Cycle: From Atmosphere to Ecosystems and Environmental Impact

The video explains the carbon cycle, highlighting the movement of carbon through the atmosphere, biosphere, hydrosphere, and lithosphere. It details how CO2 enters plants via photosynthesis and moves through terrestrial and aquatic ecosystems. The video also covers how CO2 returns to the atmosphere through various processes like fossil fuel combustion and deforestation. It warns about the consequences of increased CO2 and CFCs, such as global warming and ozone depletion, and emphasizes maintaining a stable carbon concentration.

What is the concentration of carbon in the atmosphere?

• 30 percent

• 0.3 percent

• 0.03 percent

• 3 percent

How does carbon dioxide enter terrestrial organisms?

• By eating plants

• By drinking water

• Through respiration

• Through photosynthesis

In what form is carbon dioxide found in water?

• As carbonic acid

• As carbon dioxide gas

• As carbon monoxide

• As carbonates

Which of the following activities does NOT contribute to the return of CO2 to the atmosphere?

• Photosynthesis

• Respiration of animals

• Burning of wood

• Cement manufacturing

What environmental issue is caused by the release of chlorofluorocarbons (CFCs)?

• Deforestation

• Acid rain

• Soil erosion

• Ozone layer depletion