C13 Flashcards
What was the earth’s early atmosphere like?
scientists suggest it was made up of mostly carbon dioxide, water vapour and nitrogen.
Explain how the early atmosphere developed.
A theory is the gases in card one were released from a volcano.
What are some of the limitations of the theory of how the Earth’s atmosphere formed?
There is no evidence because this could of happened billions of years ago.
Describe how the Earth’s atmosphere has changed over time.
There has been a big decrease in the percentage of carbon dioxide but an increase in nitrogen.
Give three ways the levels of CO2 have decreased.
- CO2 was stored in rocks
- Plants and trees take in CO2 along with water
- Transferred to animal tissues
Why has the atmosphere not changed much for the last 200 million years?
This is due to the natural cycle of carbon.
Name three greenhouse gases.
- Carbon dioxide
- Methane
- Water Vapour
Explain how greenhouse gases increase the temperature of the atmosphere.
Greenhouse gases absorb infrared radiation which raises their temperature and gets trapped in the atmosphere raising the temperature.
Explain how human activity affects proportions of gases in the atmosphere.
The use of fossil fuels when using electricity, heating homes and running cars.
Why do people disagree on the causes of climate change?
It is difficult to predict.
Explain some of the possible effects of climate change.
More extreme weather
The impacts on farming e.g food production.
What are some methods of reducing greenhouse gas emissions?
Electric cars
Use less electricity e.g. modern dishwashers and washing machines
What is a carbon footprint?
the amount of greenhouse gases you produce.
What are some problems with trying to reduce greenhouse gas emissions?
More expensive ( electric cars)
