Page 151 - Knowledge Organiser Yr8 24-25

Knowledge Base: Science 8.11 Earth and Atmosphere Year 8
5. The Carbon Cycle
5.1
Which gases is the atmosphere mostly made up of?
Nitrogen (78%) and Oxygen (21%). Other gases are found in smaller proportions, such as carbon dioxide and water vapour.
5.2
Which two gases in the atmosphere are essential for life?
Carbon Dioxide and Oxygen
6.2
Give two ways the humans add more carbon dioxide to the atmosphere than is removed.
Burning fossil fuels and deforestation
6.3
Why do humans burn fossil fuels?
To generate electricity, heat homes and fuel vehicles
5.3 Why is oxygen needed? Respiration of plants and animals
6. Climate Change
6.1 What is climate change? A long-term change in weather patterns
6.4 What is deforestation? Cutting down forests or burning them
5.4
Why is carbon dioxide needed?
Photosynthesis in plants and to keep the earth warm.
5.5
What happens to the level of carbon dioxide in the atmosphere?
It is constantly changing
5.6
What are two processes that add carbon dioxide to the atmosphere?
Respiration and Combustion
5.7
What are two processes that remove carbon dioxide from the atmosphere?
Photosynthesis and Dissolving in the Oceans
5.8
What is the carbon cycle?
Shows how carbon dioxide enters and leaves the atmosphere and how carbon and its compounds enter and leave carbon stores.
5.9
What are the six carbon stores?
Atmosphere, oceans, sedimentary rocks, fossil fuels, plants and animals, soil.
5.10
What is decomposition?
The process of breaking down material to release nutrients back into the soil.
5.11
How do dead organisms return carbon to the atmosphere?
Dead organisms are decomposed by bacteria and fungi, and the carbon in their bodies is returned to the atmosphere as carbon dioxide.
6.5
Why does deforestation mean an increase in carbon dioxide?
There are less trees to absorb carbon dioxide
6.6
What would happen if there was no carbon dioxide in the atmosphere?
The earth would be too cold for life
6.7
What is the greenhouse effect?
The trapping of the sun's energy due to gases in the Earth's atmosphere.
6.8
What are greenhouse gases?
Gases such as water vapour, carbon dioxide, and methane in the Earth’s atmosphere that trap heat.
6.9
What term do we give to increasing global temperatures
Global Warming
6.10
Give 5 effects of global warming
Sea levels rising, oceans warming up, more extreme weather events, changes to habitats, more tropical diseases.
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