Carbon cycle

All of the carbon in existence is...

• destroyed and then recreated

• mostly recycled, with some being lost

• continually recycled

• mostly recycled, with some being added over time

Carbon is stored as carbon dioxide in which sphere?

• atmosphere

• lithosphere

• biosphere

• hydrosphere

Carbon is found in the lithosphere mainly in the form of...

• carbon dioxide

• carbonic acid

• carbonate minerals

• carbohydrates

Photosynthesis is the process that moves carbon into which sphere?

• atmosphere

• lithosphere

• biosphere

• hydrosphere

Which of the processes below does NOT release carbon into the atmosphere?

• combustion of fuels

• aerobic respiration

• decomposition of organic matter

• volcanic eruptions

• dissolution of CO2

Animals use O₂ in the process of _________ to make CO₂

• photosynthesis

• aerobic respiration

• decomposition

• fermentation

The carbon in coal, oil and natural gas came from...

• the combustion of fossil fuels

• the remains of dead organisms

• dissolved carbon dioxide in water

• carbon-fixing bacteria in swamp soil

Which of the following are the products of respiration?

• oxygen + glucose + energy

• glucose + carbon dioxide + sunlight

• carbon dioxide + water + energy

• carbon dioxide + water + sunlight

Carbon is found as carbonic acid in which sphere?

• atmosphere

• lithosphere

• biosphere

• hydrosphere

Organisms that do not decompose naturally can be buried and become...

• carbon dioxide

• calcium carbonates

• alcohols

• fossil fuels