Geography Flashcards
How does orbital theory work?
Every 100,000 years or so the earths orbit changes from circular to egg shaped.
How does sunspots effect climate change?
Spots on the sun that burn hotter causing the earth to heat up
How do volcanic eruptions effect climate change?
As a volcano explodes ash clouds rise blocking the sun which makes the earth cooler
How do asteroids effect climate change?
A large cloud of dust would be thrown up from the impact, blocking the sunlight
What are 3 main impacts of climate change in Africa?
- Spread of malaria in rainy areas
- Decreased rainfall
- Changes in rainfall
- Food insecurities
How do tree rings help us to know past climates?
The number of rings show how many years the tree has been there
How do ice cores help us to know past climates?
Air bubbles are trapped and have carbon dioxide which means more Co2.
More CO2 = warming.
How do historical sources help us to know past climates?
You could look back at diaries, paintings, pictures ect and see the differences of how it was then to how it is now.
Explain how replanting trees helps to reduce the impacts of climate change
Replanting trees would reduce soil erosion and absorb Co2
Explain how increasing the use of public transport helps to reduce the impacts of climate change.
Less emission of green house gasses.
Explain how increasing price of fuel helps to reduce the impacts of climate change.
Increasing the price of fuel makes people not want to use vehicles as much because the prices have gone up.
How are glaciers being affected by climate change?
Glaciers are rapidly melting, calving off into the sea and retreating on land.
How is Arctic Sea ice being affected by climate change?
Summer Arctic sea ice extent is shrinking by 13% per decade and the sea ice cover continues to be younger and thinner
How is sea levels being affected by climate change?
Flood coastal areas like the maldives.
How is methane emitted?
Agriculture, fossil fuels, and decomposition of landfill waste.
How is carbon dioxide emitted?
Through burning fossil fuels, solid waste, trees and other biological materials.
How are hydrocarbons emitted?
Burning fossil fuels, including gasoline in automobile engines
How is nitrous oxide emitted?
Nitrous oxide is emitted during agricultural, land use, and industrial activities; combustion of fossil fuels and solid waste; as well as during treatment of wastewater
Explain the Green house effect in 6 points
Electromagnetic radiation at most wavelengths passes through the Earth’s atmosphere.
The Earth absorbs most of the radiation and warms up.
The Earth radiates energy as infrared radiation.
Some of the infrared radiation goes into space.
Some of the infrared radiation is absorbed by greenhouse gases in the atmosphere.
The lower atmosphere warms up.
What is the thermohaline circulation?
Thermohaline circulation is a part of the large-scale ocean circulation driven by global density gradients formed by surface heat and freshwater fluxes.
