Carbon Cycle Review

Why is carbon essential for all life on Earth?

• It is the primary component of water.

• It is needed to make all organic molecules required by living things.

• It is the main gas in the atmosphere.

• It helps regulate Earth's temperature by reflecting sunlight.

What process allows plants to take in carbon dioxide from the atmosphere and convert it into sugars?

• Respiration

• Decomposition

• Photosynthesis

• Combustion

Which of the following processes releases carbon dioxide back into the atmosphere?

• Photosynthesis and fossil fuel formation

• Respiration and decomposition

• Extraction and absorption

• Only combustion

How are fossil fuels like coal, oil, and natural gas formed?

• Through volcanic eruptions and cooling lava.

• From the decomposition of rocks over millions of years.

• From dead organisms and waste buried deep in the Earth under intense heat and pressure.

• By plants absorbing excess carbon dioxide from the atmosphere.

What is a consequence of burning fossil fuels?

• It reduces the amount of carbon dioxide in the atmosphere.

• It leads to the formation of new organic molecules.

• It releases carbon dioxide into the atmosphere, potentially impacting Earth's climate.

• It primarily creates water vapor, with no significant impact on carbon levels.