c9 atmosphere

Question 1

composition of the atmosphere

Answer 1

80% nitrogen
20% oxygen
+ other gases including co2, water vapor etc.

Question 2

How did oxygen release?

Answer 2

photosynthesis by algae and plants released oxygen

Question 3

equation for photosynthesis

Answer 3

carbon dioxide + water ——-> glucose + oxygen
light

Question 4

what is carbon footprint?

Answer 4

the total amount of greenhouse gases emitted over the full life of something

Question 5

how did carbon dioxide decrease?

Answer 5

algae and plants absorbed carbon dioxide through photosynthesis

Question 6

greenhouse gases

Answer 6

water vapour
carbon dioxide
methane

Question 7

what is causing global warming?

Answer 7

human activities are increasing the amount of greenhouse gases

Question 8

how is methane released?

Answer 8

farming cattle
landfill

Question 9

how is co2 released?

Answer 9

burning fossil fuels
deforestation

Question 10

global warming effects (4)

Answer 10

glaciers melting
sea levels rising
more floods/droughts
habitats changing