What is meant by the greenhouse effect?

Plants in greenhouses release extra oxygenCorrect answerYour answerThe ozone layer lets in more ultraviolet lightCorrect answerYour answerSome gases in the air trap heat given off by the Earth, keeping the surface warmCorrect answerYour answerThe Earth moves closer to the SunCorrect answerYour answer

Show the answer and explanation

CorrectNot quiteAnswer C

Correct answer: C

Sunlight warms the ground, which gives off heat as infrared radiation.
Greenhouse gases absorb much of it and send part back down, like the glass of a greenhouse.

Worth noting

The natural greenhouse effect is essential for life; the problem is the extra warming from added gases.

Concept: The greenhouse effect
Typical timeTypical: 60 s
Your timeYours: —

The rule this testsOzone layer and greenhouse effect

Practise this chapter →

Ten questions from Pollution, Climate and Conventions, at your own pace.

What is meant by the greenhouse effect?

Explanation