The early atmosphere was mainly carbon dioxide and water vapour. Human activities are releasing greenhouse gases which are causing global warming, and other atmospheric pollutants.
Which of the following gases was probably a major part of the early atmosphere?
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?
Which of the following is the correct word equation for photosynthesis?
glucose → carbon dioxide + ethanol
glucose + oxygen → carbon dioxide + water
carbon dioxide + water → glucose + oxygen
Which process removed carbon dioxide from the atmosphere?
Formation of igneous rocks
Formation of sedimentary rocks
Formation of metamorphic rocks
Why did nitrogen build up in the atmosphere?
It is unreactive
It is produced by respiration
It is produced by farming
Which gas is produced during incomplete combustion of a hydrocarbon fuel?
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 gas, produced by the combustion of fossil fuels, causes acid rain?