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Name: ______________________ Date: _____________________ Using Google EarthTM to Interpret Features Purpose: At the end of this activity, you should be able to: 1. Use Google EarthTM to measure a distance. 2. Use Google EarthTM to compare elevations and calculate average gradient. 3. Use Google EarthTM to create a polygon and use it to measure perimeter and area. Materials: You must have Google EarthTM installed on your computer and an internet connection. You should already know how to do some basic Google EarthTM navigation. Introduction: Google EarthTM can be used to get a sense of slope and other features of landforms. It can quickly and easily compare values between different features. Procedures: 1. Open up Google EarthTM or Google EarthTM Pro. 2. Use the “Fly to” feature to go to Sylvan Beach, NY. 3. Put a placemark at Sylvan Beach. 4. Use the ruler function to draw a line 10 km due east (heading 90°), a line 10 km due north (heading 0°), and one 10 km due south (heading 180°). Save the lines. 5. Use those lines to answer Conclusion questions 1 - 4. 6. Use the “Fly to” feature to go to Gore Mountain, NY (if you ski, you may recognize a few of the trails). Put a placemark at the peak (highest point) of Gore Mountain. 7. While holding the mouse wheel, move the mouse forward and back to tilt the view so you are looking “up” or “down” the mountain. 8. Use the ruler function to draw a line 10 km due east, a line 10 km due north, and one 10 km due south. Save the lines. 9. Use those lines to answer Conclusion questions 5 - 7. NYS Earth Science Mapping and Models Using Google EarthTM to Interpret Features Page 1 of 3 10. Compare those gradients with the gradients found elsewhere. “Fly to” the Needle Mountains, CO. Put a placemark at the peak of Mount Eolus. 11. While holding the mouse wheel, move the mouse forward and back to tilt the view so you are looking “up” or “down” the mountain and the other mountains in the range. 12. Use the ruler function to draw a line 10 km due east, a line 10 km due north, and one 10 km due south. Save the lines. 13. Use those lines to answer Conclusion questions 8 - 11. 14. Now calculate the area of the largest lake that lies entirely within New York State, Oneida Lake. “Fly to” Oneida Lake. 15. Use the “Add Polygon” tool to draw a polygon around the edge of Oneida Lake. To draw a polygon, click a starting point and drag the mouse around the edge of the area you intend to measure. The polygon will appear as a white area over where you drag the mouse. When you get back to the starting point, release the mouse. Save the polygon as “Oneida Lake surface”. 16. Once the polygon is complete, go to the “Measurements” tab of the “New Polygon” window to find the area and perimeter of the polygon just drawn. 17. Now, draw a polygon, in the same way, around the edge of Lake Ontario. Save the polygon as “Lake Ontario surface”. 18. Use those polygons to answer Conclusion questions 12 – 14. 19. “Fly to” Barringer Crater. The Barringer Meteorite Crater was formed approximately 50,000 years ago when a 50 m diameter meteor made it through the Earth’s atmosphere and crashed into the crust. Although this is not the largest crater on Earth, the dry conditions in Arizona have kept it remarkably well preserved. 20. Calculate the volume of material that was ejected by the impact of the meteor that caused the Barringer Crater. Assume that the Barringer Crater is a half a sphere. The formula for finding the volume of a sphere is 4/3 ∏ r3. Conclusions: 1. What is the elevation at Sylvan Beach? ____________________________ 2. What is the elevation at the end of each of the lines that you drew? East: _____________ North: ____________ South: ___________ NYS Earth Science Mapping and Models Using Google EarthTM to Interpret Features Page 2 of 3 3. What is the average slope for the lines that you drew? East: _____________ North: ____________ South: ___________ 4. Considering only slope, which direction would it be easiest to walk? ______ 5. What is the elevation at the peak of Gore Mountain? __________________ 6. What is the elevation at the end of each of the lines that you drew? East: _____________ North: ____________ South: ___________ 7. What is the average slope for the lines that you drew? East: _____________ North: ____________ South: ___________ 8. What is the elevation at the peak of Mount Eolus? ____________________ 9. What is the elevation at the end of each of the lines that you drew? East: _____________ North: ____________ South: ___________ 10. What is the average slope for the lines that you drew? East: _____________ North: ____________ South: ___________ 11. Of the 3 areas seen so far the steepest slope is found at the __________________________ side of ___________________________ 12. What is the Area of Oneida Lake? __________ Sq. miles ________ Sq. km 13. What is the Area of Lake Ontario? __________ Sq. miles ________ Sq. km 14. The area of Lake Ontario is approximately how many times bigger than Oneida Lake? _________________________________________________ 15. What is the volume of material ejected when Barringer crater was formed? _________________ km3 NYS Earth Science Mapping and Models Using Google EarthTM to Interpret Features Page 3 of 3