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11 Cards in this Set
- Front
- Back
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What gases and percentages make up the atmosphere? |
21% oxygen 78% nitrogen 1% other gases (CO2, argon, particulates) |
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Early atmosphere was made up of what gases and how did they come about? |
Water vapour, carbon dioxide, nitrogen and methane. Came about from volcanoes. |
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How were oceans formed? |
Water vapour began to condense as the earth began to cool. CO2 began to dissolve into the oceans and later became incorporated into sedimentary rocks |
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How do scientists know about the development of our atmosphere |
They look at the chemical composition of rocks, which can give clues about what the atmosphere was like when the rocks were formed. They have to know the age of the rock too.
They can also look at fossils of early life and conclude that early plant life increased oxygen levels. As oxygen levels increased co2 decreased |
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Why is sulfur dioxide harmful? SO2 |
It reacts with oxygen and water to produce ACID RAIN. These damages buildings and harms animals and plants |
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Why is carbon monoxide harmful? CO |
It's poisonous . It changes the amount of oxygen in people's blood, this can make people's existing heart conditions worse |
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Carbon dioxide CO2 |
Increases global temperature |
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why is nitrogen monoxide harmful? NO |
Reacts in the atmosphere to form nitrogen dioxide |
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Why is nitrogen dioxide harmful? NO2 |
Reacts with water and oxygen and produced ACID RAIN. Can also cause breathing problems and make asthma worse |
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What are particulates? |
Tiny bits of solid suspended in the air. |
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Why are particulates harmful? |
They deposit on surfaces making them dirty and when breathed in can make asthma and lung infections worse |
