Edexcel C1 Topic 1
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What is the percentage of nitrogen in today's atmosphere?
How did oceans form in the Earth's early atmosphere?
Water vapour condensed
What produced gasses in the Earth's early atmosphere?
Name 3 processes that increase levels of carbon dioxide.
- Burning fossil fuels
- Livestock farming
- Volcanic Activity
What is the percentage of oxygen in today's atmosphere?
Which was the most abundant gas in the Earth's early atmosphere?
What is the word equation for iron reacting with oxygen?
Iron + Oxygen --> Iron Oxide
How did oxygen begin to be produced in the Earth's early atmosphere?
Plants carrying out photosynthesis
What is the most abundant gas in today's atmosphere?
Name 2 processes that decrease levels of carbon dioxide.
- Dissolving in oceans
How did levels of carbon dioxide begin to decrease in the Earth's early atmosphere?
Carbon dioxide dissolved in oceans
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