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June 10, 2012
GEOG 2050 – Homework 1
Question 1: Explain how time zones are related to longitude.
Time zones relate to longitude through the earth’s rotation. Since the earth rotates 360 every
24 hours from east to west, it rotates 15 per hour. This establishes a time zone of one hour,
measuring 7.5 on both sides of a central meridian. Each hour is a measure of how far ahead or
behind a time zone is in relation to the prime meridian.
Question 2: List the 4 layers of the atmosphere from Top to Bottom.
1. Thermosphere with range of 80 to 550+ kilometers
2. Mesosphere with range of 50 to 80 kilometers
3. Stratosphere with range of 13 to 50 kilometers
4. Troposphere with range of 0 (ground level) to 13 kilometers
Question 3: What is the Solar Constant, and why does it vary during the year?
The solar constant is the amount of solar radiation received at the top of the atmosphere. It
varies during the year due to Earth’s revolutions and curved surface: the concentration levels of
solar rays are not equal for all latitudes.
Question 4: Why is there a temperature inversion in the stratosphere?
The stratosphere has a temperature inversion due to its absorption of shortwave energy by the
ozone layer. The shortwave energy comes from the thermosphere where it was absorbed by
nitrogen and oxygen.
Question 5: Explain the difference between advection and convection.
Both convection and advection are methods of transferring heat energy from one place to
another in a gas or a liquid. However, convection uses a vertical motion, while advection uses a
horizontal motion to transfer the energy.
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