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Card 16
Front
Why is the ozone layer important?
Back
Card 17
Front
How is carbon dioxide returned to the atmosphere in the carbon cycle?
Back
Card 18
Front
What has caused the carbon dioxide levels rising dramatically over the last 150 years?
Back
Card 19
Front
What 2 effects does chopping down and burning trees have on the atmospheric carbon dioxide levels?
Back
Card 20
Front
What is global warming?
Back
Card 21
Front
What is causing global warming?
Back
Card 22
Front
Give 2 possible consequences of global warming
Back
Card 23
Front
Why are radio waves good at transmitting information over long distances?
Back
Card 24
Front
Give 2 uses of microwaves
Back
Card 25
Front
What advantages do digital signals have over analogue signals?
Back
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