More cards in this set

Card 16

Front

how is carbon dioxide decreased?

Back

Preview of the front of card 16

Card 17

Front

how is oxygen increased?

Back

Preview of the front of card 17

Card 18

Front

how to test for oxygen?

Back

Preview of the front of card 18

Card 19

Front

how does human activity and greenhouse gases relate?

Back

Preview of the front of card 19