C9 Atmosphere Flashcards
How long ago do scientists believe that the earth was formed?
4.5 billions years ago
When do they think that life began on earth?
3.8 billion years ago
What formed the Earth’s early atmosphere?
Volcanic activity
Which has was prominent in the early atmosphere?
Carbon dioxide
Name other gases that were present in the Earth’s early atmosphere.
Water vapour, methane and ammonia
What are the reasons why scientists thought that the early atmosphere contained little/no oxygen?
The rocks on the earth’s surface had little/no oxygen in it
Why did the percentage of carbon dioxide in the earth’s early atmosphere decreased.
Plants carried out photosynthesis which removed carbon dioxide from the atmosphere
What process releases carbon monoxide into the Earth’s atmosphere?
Incomplete combustion
Name three greenhouse gases
Carbon dioxide, Methane, Water vapour
Name one way greenhouse gases emissions could be reduced
Renewable resources e.g solar panels
Name one reason why it is difficult for some countries to reduce emissions of greenhouse gases
It can be expensive
Effects of global climate change
Forest fires happen which turns into deforestation
Making the environment warmer
Why is it important that sulfur dioxide is not released into the atmosphere?
Sulfur dioxide causes acid rain
Which two gases are produced when fuels burn in car engines?
Carbon monoxide
Carbon dioxide
Why is it important to stop carbon monoxide from being released into the air?
Because it is toxic
