Carbon Cycle

The carbon cycle is a process that involves the movement of carbon through the atmosphere, oceans, soil, and living organisms. Which of the following best describes this cycle?

• A process of carbon movement through various Earth systems

• A cycle that only involves the atmosphere

• A process that only occurs in oceans

• A cycle that is unrelated to living organisms

Carbon "sinks" are:

• natural systems that absorb more carbon than they release

• artificial reservoirs for storing carbon

• areas with high carbon emissions

• technological devices for capturing carbon

Which of the following processes contribute to the removal of carbon dioxide from the atmosphere?

• Photosynthesis, ocean absorption, and formation of calcium carbonate

• Photosynthesis, volcanic eruptions, and combustion

• Ocean absorption, deforestation, and burning fossil fuels

• Formation of calcium carbonate, respiration, and photosynthesis

What are carbon "sources"?

• Processes or activities that release carbon dioxide into the atmosphere

• Natural reservoirs that store carbon

• Technologies that capture carbon from the atmosphere

• Organisms that consume carbon dioxide

Carbon re-enters the atmosphere through various processes. What are 3 ways carbon re-enters the atmosphere?

• Respiration, combustion, and decomposition

• Photosynthesis, respiration, and combustion

• Decomposition, photosynthesis, and fossilization

• Combustion, fossilization, and photosynthesis

Name the process plants use to break down carbon dioxide.

• Photosynthesis

• Respiration

• Transpiration

• Glycolysis

Fossil fuels form from:

• Decomposed organic matter over millions of years

• Instantaneous chemical reactions

• Volcanic eruptions

• Photosynthesis

What are some processes that return carbon back to the atmosphere?

• Photosynthesis

• Respiration

• Combustion

• Decomposition

What are 2 ways in which humans can have a positive impact on the carbon cycle?

• Planting trees and reducing fossil fuel use

• Increasing deforestation and industrialization

• Using more plastic and increasing waste

• Burning more fossil fuels and cutting down trees

The carbon cycle is:

• a process by which carbon is exchanged between the atmosphere, land, and ocean

• a method of producing carbon-based fuels

• a cycle that only occurs in plants

• a process that only involves the ocean