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Carbon Reservoirs and Forms Quiz

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Questions and Answers

What is the characteristic of organic carbon?

It is reduced carbon that stores energy and is combined with carbon, hydrogen, or nitrogen atoms (correct)

It is a source of CO2 for the atmosphere depending on circulation and productivity regime

It diffuses along a concentration gradient from higher to lower concentrations

It is oxidized carbon combined with oxygen, such as in CO2 gas or CaCO3 minerals

Where does the process of CO2 combining with water to form carbonic acid occur?

In the atmosphere and soil

In rainwater and seawater (correct)

In biomass and fossil fuel

In the Earth's crust and mantle

What are the carbon reservoirs near the Earth's surface primarily composed of?

Organic carbon in the form of biomass, fossil fuel, and kitchen compost

Inorganic carbon in the form of CH4 and NO2

Inorganic carbon in the form of CO32-, CaCO3, and HCO3- (correct)

Carbonic acid and CO2 gas

What are the main minerals found in carbonates?

Calcite and dolomite Signup and view all the answers

What is the chemical formula for carbonic acid?

H2CO3 Signup and view all the answers

What process eats away at carbonate and silicate rocks to produce bicarbonate ions, dissolved silica, and calcium ions?

Chemical weathering Signup and view all the answers

What promotes the diffusion of CO2 back to the atmosphere according to the text?

Presence of carbonic acid Signup and view all the answers

What is the net effect of limestone weathering on land and carbonate mineral formation & burial in the ocean?

Zero Signup and view all the answers

What is the approximate rate of CO2 removal by the combined processes of silicate weathering on land and carbonate mineral deposition in the ocean?

~ 0.03 Gt (C)/yr Signup and view all the answers

What provides the return flow to balance the CO2 removal from silicate weathering on long time-scales?

Plate tectonic processes Signup and view all the answers

What is the surface temperature of Venus according to the text?

730 K Signup and view all the answers

What is the approximate surface temperature of Earth according to the text?

288 K Signup and view all the answers

What diminishes the effect of disturbances according to the text?

Negative feedback loops Signup and view all the answers

What is the main mineral found in silicates according to the text?

Quartz Signup and view all the answers

What is the main component of carbonate minerals according to the text?

Carbon Signup and view all the answers