Explain how Earth and its atmosphere formed. 2. How is today’s atmosphere similar to and different from the early Earth’s atmosphere?

3. Describe how oxygen came to compose al-

most 21% of the atmosphere today.

4. Given that solar output had increased over the

past 4.6 billion years, how have Earth’s temperatures remained fairly constant over that

same time?

5. What is residence time and why is it important?

6. What is the carbon cycle and how does it

operate?

7. Describe the thermal structure of the

atmosphere.

8. What causes the thermal characteristics

associated with each thermal layer of the

atmosphere?

9. Compare and contrast the heterosphere and

the homosphere.

10. Why is there no defined top to the atmosphere?

In a recent telephone survey, 5,000 randomly selected teenagers were asked to cite their primary social network site. six of 10 teenagers said they use mybook as their primary social network site. a 95% confidence interval to estimate the true proportion of teenagers who use mybook as their primary social network site is found to be (0.2964, 0.9036). which of the following is a correct interpretation of the confidence level? ninety-five percent of all samples of this size would yield a confidence interval of (0.2964, 0.9036). there is a 95% chance that the true proportion of teenagers who use mybook as their primary social network site is in the interval (0.2964, 0.9036). ninety-five percent of the time, the procedure used to generate this interval will capture the true proportion of teenagers who use mybook as their primary social network site. ninety-five percent of all the samples of size 5,000 lie in the confidence interval (0.2964, 0.9036).