Chapter Two

CHAPTER TWO

1. Answer: b. There are many forms of energy to consider. Energy can be transferred from one form to another; in this case, thermal energy or heat is applied to gas molecules, which then have increased kinetic energy or movement.

2. Answer: d. The temperature gradient between the two objects is what most contributes to the rate of heat transfer in a conduction situation.

3. Answer: b. About 70 percent of the sun's rays are absorbed by the earth or the atmosphere around it. The rest is immediately reflected back into space.

4. Answer: d. The greenhouse effect long predated mankind on earth; the concern now is that the greenhouse effect has become accelerated by man rather than caused by our activities.

5. Answer: a. Dry desert tundra has little moisture it and little vegetation. For this reason, it will lose heat much faster than any wet area or an area with a lot of vegetation.

6. Answer: c. As you ascend 1000 feet, you can expect a 2 degree Celsius decline in temperature. This means that after 2000 feet, you will experience a decline of 4 degrees Celsius.

7. Answer: b. The atmospheric gases will trap the heat the earth has absorbed and will most prevent large losses of the heat gotten during the day by the sun.

8. Answer: c. The rays coming from the sun come in many forms. For the most part, it's the infrared waves that cause the heating of the earth.

9. Answer: b. Methane is given off by the digestive processes of ruminant animals; it is responsible for a great portion of the greenhouse gas effect.