A scientist describes an area containing plants, animals, microorganisms, soil, water and air where living organisms interact. Which Earth system does this describe most accurately?

Why does the biosphere overlap with the other three Earth systems?

Which sequence correctly shows carbon moving from the atmosphere into a plant and then back into the atmosphere?

A plant is exposed to light and has access to water and carbon dioxide. Which change would indicate that photosynthesis is occurring?

Which statement best explains why respiration contributes to the carbon cycle?

A tree undergoes photosynthesis during the day and cellular respiration continuously. Which statement is correct?

A bushfire burns a large area of forest. Which combination best describes the immediate effect on the carbon cycle?

Which process transfers carbon from dead organisms back into the environment?

A fossil fuel deposit has remained underground for millions of years. When coal is mined and burned, which sequence best represents the movement of carbon?

Carbon is found in the hydrosphere mainly as:

Which example demonstrates an interaction between the atmosphere and hydrosphere involving carbon?

Carbon dioxide dissolves in rainwater and forms carbonic acid. What can this process contribute to?

Which process can transfer carbon from the geosphere back into the atmosphere?

A scientist finds carbon stored in limestone deep underground. Which Earth system is the carbon primarily associated with?

Which situation represents carbon moving from the biosphere into the atmosphere?

Why does deforestation generally result in an increase in atmospheric carbon dioxide?

A forest is cleared and replaced with crops that have a lower rate of photosynthesis. Which outcome is most likely?

Mining can affect the carbon cycle in more than one way. Which combination is most accurate?

Which reaction represents combustion?

A student says, “Combustion and cellular respiration are completely unrelated because one occurs in engines and the other occurs in cells.” Which response is most scientifically accurate?

Nitrogen oxides and sulfur dioxide released by industry can contribute to acid rain because they:

Which chain best explains how burning fossil fuels can contribute to climate change?

A forest is cleared, the timber is burned, and the land is later used for cattle farming. Which combination of processes could increase greenhouse gases in the atmosphere?

A student places an aquatic plant in water containing dissolved carbon dioxide. In bright light, the amount of dissolved carbon dioxide decreases. Which explanation best accounts for this observation?

Which statement best explains why the hydrosphere is important to the carbon cycle?