We know the atmosphere as ______.
A: the total amount of oxygen over the earth
B: mixture of gases surrounding the earth
C: a source of storms
D: the diffusion of waste gas
A: the total amount of oxygen over the earth
B: mixture of gases surrounding the earth
C: a source of storms
D: the diffusion of waste gas
举一反三
- We should reduce the amount of greenhouse gases because it trap ______ in the atmosphere and makes the earth _______.
- As we have learned, these greenhouse gases energy in the atmosphere and make the Earth warmer.
- what the analogy is: which two things are being compared?The earth’s atmosphere is like a blanket of gases around the earth. It is only a thin layer but it helps to maintain the temperature of the earth, keeping us warm. It also offers a layer of protection from the intensity of the sun. A: earth’s atmosphere and a blanket B: earth’s atmosphere and gases C: earth’s atmosphere and a layer of protection D: earth’s atmosphere and a blanket of gases
- A variety of gases trapped in the Earth’s atmosphere can ensure life on Earth because they are ______.
- Quantity of energy contained in the atmosphere is ______. A: smaller than that in coal alone B: smaller than that either in oil or in gas that we have on Earth C: greater than that in coal, oil and gas on Earth combined D: greater than that in coal, oil and gas on Earth, respectively