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Question 18M.2.HL.TZ1.a

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Date May 2018 Marks available [Maximum mark: 4] Reference code 18M.2.HL.TZ1.a
Level HL Paper 2 Time zone TZ1
Command term Outline Question number a Adapted from N/A
a.
[Maximum mark: 4]
18M.2.HL.TZ1.a

Outline how greenhouse gases interact with radiation and contribute to global warming.

[4]

Markscheme

a. carbon dioxide is a greenhouse gas 

b. methane/nitrogen oxide/water vapour is a greenhouse gas 

c. sunlight/light/(solar) radiation passes through the atmosphere (to reach the Earth’s surface) 

d. CO2 in atmosphere/greenhouse gases absorb/trap/reflect back some radiation/heat (emitted by the Earth’s surface) 

e. CO2 in atmosphere/greenhouse gases allow short wave radiation to pass (through atmosphere) but absorb long wave/infra-red 

f. solar radiation/sunlight is (mostly) short wave 

g. radiation/heat emitted by the Earth is long wave/infra-red

Allow answers presented in a clearly annotated diagram.

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