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Question 18N.2.SL.TZ0.6c

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Date November 2018 Marks available [Maximum mark: 2] Reference code 18N.2.SL.TZ0.6c
Level SL Paper 2 Time zone TZ0
Command term Outline Question number c Adapted from N/A
c.
[Maximum mark: 2]
18N.2.SL.TZ0.6c

The ratio  distance of Mars from the Sun distance of Earth from the Sun = 1.5.

(c)

The atmosphere of Mars is composed mainly of carbon dioxide and has a pressure less than 1 % of that on the Earth. Outline why the greenhouse effect is not significant on Mars.

[2]

Markscheme

recognize the link between molecular density/concentration and pressure ✔

low pressure means too few molecules to produce a significant heating effect

OR

low pressure means too little radiation re-radiated back to Mars ✔

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