There is evidence that the Earth's early atmosphere contained less oxygen, but more carbon dioxide and water vapour, than today. Increased emissions of greenhouse gases are leading to climate change.
Which of the following gases was probably a major part of the early atmosphere?
In the modern day atmosphere, what is the approximate percentage of nitrogen?
The early atmosphere contained a lot more water vapour than the modern atmosphere. Where did it go?
It escaped into space
It condensed to form the oceans
It was absorbed by plants
What biochemical process absorbs carbon dioxide from the atmosphere and replaces it with oxygen?
What is the laboratory test for oxygen?
Puts out a glowing splint
Makes a squeaky pop sound with a burning splint
Relights a glowing splint
What is the name of the atmospheric process which keeps the Earth warm by absorbing radiation from the Sun?
Which of the following is a greenhouse gas?
Which of the following is a cause of global warming?
Burning fossil fuels to generate electricity
Using wind farms to generate electricity
Using solar cells to generate electricity
Which of the following is an effect of global warming?
Flooding of low lying coastal land
Longer days in the summer
More crops to feed a growing world population
Which of the following could help reduce one of the possible effects of global warming?
Moving to colder parts of the world
Planting drought-resistant crops
Fracking to extract more fossil fuels from the crust