Skip to content

Course home

Interpreting and interacting with earth systems

Interpreting and interacting with earth systems

EasyMediumHard
12345678910111213141516171819202122232425
Question 12

Feedback loops are central to interpreting and interacting with Earth systems. The following sentences describe the steps of the permafrost carbon feedback loop, a major positive feedback mechanism in the global climate system, but they are not listed in their correct causal sequence:

  1. Increased anaerobic and aerobic decomposition of newly accessible organic matter by soil microbes.
  2. Enhanced absorption and re-emission of outgoing longwave radiation, increasing radiative forcing.
  3. A persistent rise in global atmospheric temperatures.
  4. Release of significant volumes of methane (CH4\text{CH}_4CH4​) and carbon dioxide (CO2\text{CO}_2CO2​) into the atmosphere.
  5. Thawing of organic-rich permafrost soils in high-latitude regions.

What is the correct causal sequence of this feedback loop, starting with an initial temperature increase?

A

3,1,5,4,23, 1, 5, 4, 23,1,5,4,2

B

3,5,1,4,23, 5, 1, 4, 23,5,1,4,2

C

5,4,1,2,35, 4, 1, 2, 35,4,1,2,3

D

5,1,3,4,25, 1, 3, 4, 25,1,3,4,2

Markscheme

Interpreting and interacting with earth systems Questions

  1. GCSE
  2. /Chemistry
  3. /Interpreting and interacting with earth systems

32 exam-style questions on OCR GCSE Chemistry Interpreting and interacting with earth systems. Each one has a worked solution and a mark scheme showing where the marks go.

Question bank