2. Weathering is shown as a process that transfers carbon from rocks to carbon i

ID: 292508 • Letter: 2

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2. Weathering is shown as a process that transfers carbon from rocks to carbon in the ocean. Based on your knowledge of chemical weathering (from earlier this quarter) explain how weathering of carbonate rocks results in a source of carbon for the oceans. Be as specific as possible and give chemical formulae.

3. Sedimentary rocks are the only rock type shown on this carbon cycle. Explain why volcanic rocks and processes should also be part of a consideration of the carbon cycle.

4. Rock formation is shown as being connected to the ocean floor and ocean sediment. Why is this incorrect for coal?

5. Humans are speeding up the process of bringing fossil fuels Earth’s surface. What natural processes would normally cause this to happen?

CARBON CYCLE Carbon stores Atmosphere Processes Burning fossil fuels Carbon dioxide Deca Soil and organic matter Vegetatiorn Weathering and run-off Coal, oil, gas Ocean surface Deep dirculation Sediments and rock Rock formation Sinking sediment Deep ocean 2007-2010 Te University of waikato! www.sdenceleam.org.nz

Explanation / Answer

1.carbonate rocks mostly form in the shallow marine environment.

2.When it rains in land the rain water falling contains dissolved CO2 forming carbonic acid

CO2 + H2O = H2CO3 ;The carbonic acid reacts with the terrestial rocks in varying degrees depending on its chemical composition.Rocks containing carbonates(limestone) reacts more quickly

H2CO3 + CaCO3 = Ca(HCO3)2

carbonic acid + calcium carbonate = calcium bicarbonate (in soln)

The dissolved calcium carbonate reaches the sea via river and groundwater where they are reprecipitated as calcium carbonate, as organic test

Ca2++ 2HCO3– = CaCO3+ CO3+ H2O

calcium ions + bicarbonate ions = calcium carbonate + carbon dioxide + water.

3.Volcanic activity is results in the formation of fine grained volcanic rocks, Volcanism is associated with evolution of various volcanic emissions such as CO2 and other volcanic gas.Besides volcanic vents at ocean floors provide growth of organism and thus is a source of carbon.

4.Coal is found in land in marshy land or bogs, the decaying plant matter subjected to high pressure and temperature turn this organic debris into coal.

5.is it burning or bringing?

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2. Weathering is shown as a process that transfers carbon from rocks to carbon i

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