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Which gas does not support burning? Oxygen - Hydrogen -Carbon dioxide -Nitrogen
Nitrogen
The percentage composition of oxygen in air is
21%
Oxygen is important on earth because it is essential for the life of
all living organisms
The composition of nitrogen gas in the atmosphere is
78%
Air is considered to be ? element - compound -mixture - a solvent
mixture
Which of the following gas is used for breathing?
Oxygen
The main human activity that releases greenhouse gases is using bottled water -burning fossil fuels - texting on cellphones - eating meat
burning fossil fuels
Global warming is caused by a phenomenon known as the greenhouse effect. (true-false)
true
What greenhouse gas is released into the atmosphere from gasoline-burning cars? Carbon dioxide - Water vapor - Ozone - Oxygen
Carbon dioxide
Which of the following best describes global warming? The current temperatures on Earth - The weather during the summer - The increase in the average temperatures on Earth
The increase in the average temperatures on Earth
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