Fill-In-The Blanks for Chapter 15

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1. Precession describes the _________ of the Earth's axis of rotation . .

2. The degree of ellipticity of the Earth's orbit around the sun is the ___________ .. .

3. There were _______ periods of ice advance in North America during the Pleistocene. . .

4. __________ deduced that large continental glaciers once covered much of the Earth's land surface. .

5. Long, narrow, winding ridges of sand and gravel found in the middle of ground moraines are called ___________.

6. When two lateral moraines merge a _________ moraine forms. .

7. A horn is surrounded by ________ .

8. Large boulders deposited randomly by glaciers are _________ . .

9. Low confining pressure at the surface causes cracks called ________ to form. .

10. Large masses of ice on land that show evidence of movement are called _________ . .

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