Chapter 2 Lesson 5 "Longitude"

Materials:

• Worksheet, "Longitude"

Objective:

• Students will define longitude.
• Students will estimate a point's longitude
• Students will compare and contrast different types of maps.

Anticipatory Set:* Students will be reminded of the lines of latitude covered in the last lesson. What are the different names of the lines of latitude? If we need a grid system to find a point on the globe, what are the lines that go up and down. Are they parallel to each other? Demonstrate how the lines of longitude are laid out on a sphere using a protractor and drawing it on a piece of paper. There is a special name for the 0 degrees longitude what is it? What do you call an ordinary line of longitude.

Teacher Input:* Show the students this picture. Explain how the degrees of longitude are laid out. Use this image to explain the difficulty of drawing a flat map from a round object. Cartographers have developed a lot of different ways to deal with the issue.
Use a Venn diagram to compare and contrast lines of latitude and lines of longitude.

Guided Practice:* Have the students look at these different types of maps and tell one of the advantages of the type of map and one of the disadvantages.

GoodeHomolosineProjection, mercator Projection, MollweideProjection, OrthographicProjection 1, 2, 3, robinsonProjection1, 2.

Independent Practice:* Have the students complete the Longitude Worksheet.

Check for Understanding:* Students should take quiz 2-5 "longitude"

Duration:

30 minutes + 10-15 for Independent Practice (Could be longer if taken for homework).

Alaska Performance Science Standards Addressed in this lesson:

• A.4 Earth
  Conduct research and make predictions about tides, weather, seasons, and phases of the moon and correlate these natural events to the motion of the Earth within our solar system.
• A.5 Forces of Nature
  Describe gravity as the force that governs orbital motion in the solar system and motion of the tides on the Earth, and describe light as radiation that travels in a straight line that can be reflected, refracted, or absorbed by matter.
• A.7 Processes that Shape the Earth
  Use models to explain how large scale movements within the Earth's interior cause changes on the Earth's surface
• A.15 Local Knowledge
  Conduct research to learn how the local environment is used by a variety of competing interests including local plant and animal populations, individual families, the local community, and outside sources such as oil and mining companies, hunting groups, and tourists.