Carbon Cycle 1

Question 1

What is the natural carbon cycle?

Answer 1

The movement and storage of carbon between the land, ocean, and the atmosphere

It involves various forms of carbon and their interactions within the environment.

Question 2

Name the three forms of carbon in the Carbon Cycle.

Answer 2

• Inorganic
• Organic
• Gaseous

Each form of carbon plays a distinct role in the carbon cycle.

Question 3

Where is inorganic carbon found?

Answer 3

In rocks as bicarbonates and carbonates

Inorganic carbon is a significant component of the geological carbon cycle.

Question 4

Where is organic carbon found?

Answer 4

In plant material and living organisms

Organic carbon is crucial for life and the functioning of ecosystems.

Question 5

Where is gaseous carbon found?

Answer 5

As CO₂ and CH₄ (methane)

Gaseous carbon is important for atmospheric processes and climate change.

Question 6

What is meant by balance in the natural carbon cycle?

Answer 6

The equilibrium between production and absorption (or sources and sinks) of carbon

Achieving this balance can take a long time, especially after disturbances like volcanic eruptions.

Question 7

True or false: It takes a long time for equilibrium to be reached in the natural carbon cycle after disturbances.

Answer 7

TRUE

For example, after a volcanic eruption, the carbon cycle may take time to stabilize.

Question 8

What is a carbon sink?

Answer 8

Any store which takes in more carbon than it emits

An example of a carbon sink is an intact tropical rainforest.

Question 9

What is a carbon source?

Answer 9

Any store that emits more carbon than it stores

An example of a carbon source is a damaged tropical rainforest.

Question 10

Carbon is present in stores of the atmosphere as _______.

Answer 10

CO₂ and methane

These gases contribute to the greenhouse effect.

Question 11

Carbon is present in stores of the hydrosphere as _______.

Answer 11

Dissolved CO₂

This form of carbon is found in oceans and other bodies of water.

Question 12

Carbon is present in stores of the lithosphere as _______.

Answer 12

• Carbonates in limestone
• Fossil fuels like coal, gas, and oil

These are significant reservoirs of carbon on Earth.

Question 13

Carbon is present in stores of the biosphere in _______.

Answer 13

• Living organisms
• Dead organisms

Carbon is a fundamental component of all life forms.

Question 14

What is carbon sequestration?

Answer 14

The transfer of carbon from the atmosphere to other stores

It can be both natural and artificial.

Question 15

Give an example of how a plant sequesters carbon.

Answer 15

Through photosynthesis

Plants store carbon in their mass during this process.

Question 16

What are the main carbon stores in order of magnitude?

Answer 16

• Marine Sediments and Sedimentary Rocks
• Oceans
• Fossil Fuel Deposits
• Soil Organic Matter
• Atmosphere
• Terrestrial Plants

These stores vary in terms of their dynamics and the amount of carbon they hold.

Question 17

Which carbon store is the largest?

Answer 17

Marine Sediments and Sedimentary Rocks

Contains 66,000 - 100,000 million billion metric tons of carbon.

Question 18

How much carbon is stored in the Oceans?

Answer 18

38,000 billion metric tons

The oceans are a dynamic store, constantly utilizing and losing carbon.

Question 19

What is the carbon storage capacity of Fossil Fuel Deposits?

Answer 19

4000 billion metric tons

Fossil fuel deposits are long-term but currently dynamic due to human exploitation.

Question 20

How long can Soil Organic Matter store carbon?

Answer 20

Over a hundred years

Deforestation and land use changes are affecting this carbon store, which holds 1500 billion metric tons.

Question 21

What has caused CO₂ levels in the Atmosphere to increase by around 40%?

Answer 21

Human activity

The atmosphere currently stores 750 billion metric tons of carbon.

Question 22

What is the carbon storage capacity of Terrestrial Plants?

Answer 22

560 billion metric tons

This store is mid-term but very dynamic and vulnerable to climate change.

Question 23

What is the main store of carbon in the Earth?

Answer 23

lithosphere

The lithosphere contains global carbon stores that are unevenly distributed.

Question 24

In which hemisphere are the oceans larger?

Answer 24

southern hemisphere

This affects the distribution of carbon storage in the oceans.

Question 25

Where does **storage in the biosphere** mostly occur?

Answer 25

on land ## Footnote The biosphere's carbon storage is primarily terrestrial.

Question 26

In which regions is **terrestrial plant storage** focused?

Answer 26

* tropics * northern hemisphere ## Footnote These areas are significant for carbon storage in plants.