Karteikarten
AQA Chemistry Unit One the earth and it's atmosphere
Karten in diesem Stapel (10)
- 1What's the structural buildup of the earth?-crust (thinnest layer)
-mantle (biggest layer)
-core
all of this is surrounded by the atmosphere - 2What are tectonic platesThe earth's crust and upper mantle are cracked into a number of large sections called tectonic plates
- 3What causes plates to move? How fast do they move?Convection currents in the mantle from radioactive processes in the core causes the plates to move at a rate of a few cm a year
- 4What happens at plate boundaries?movements between the plates can be sudden or disastrous causing earthquakes and/or volcanoes
- 5What are the proportions of gases in the air?For the past 200 million, there has been 80% nitrogen, 20% oxygen and some carbon dioxide, water and other noble gases
- 6How do scientists believe the atmosphere developed?-Volcanic activity put CO2 and water vapour in the air
-Water vapour condensed into oceans
-Plants used CO2 to produce oxygen via. photosynthesis
-Oceans stored carbon dioxide (carbon made the shells and bones of marine animals)
-Denitrifying bacteria produced nitrogen - 7How long did the early atmosphere exist for? What did it contain?For one billion years the atmosphere may have contained mainly carbon, little oxygen and some methane and ammonia
- 8What is the primodial soup theory?The idea that there were hydrocarbons and ammonia that were struck by lightning to produce amino acids. This is supported by the Miller-Urey experiment
- 9What happened to the carbon of the early atmosphere?Locked away in sedimentary rocks, carbonates or fossil fuels. Oceans also act as carbon reservoirs, but increased absorption of carbon dioxide affects the marine environment
- 10What is air?A mixture of gases with different boiling points. This means that it can be fractionally distilled to provide a source of raw materials for the industry
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- Earth and its atmosphere. Taken from the spec so it should be all that you need to know =)
- Erstellt von
- Natalia Cliff · Mai 2017
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- 18 Mai 2017
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