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A lunar eclipse can only happen during a:

Recently in the U.S., we have been changing from underground coal mining to _____.

Geologists have used radiometric dating to determine that the earth is ____ years old

Meandering rivers make bad state boundary lines because they are constantly shifting their location. In time, a meander bend may be cut off and form a crescent-shaped _____ lake. 

The Continental Divide _____.

Dust storms can cause all of these environmental problems EXCEPT _____.

_____ are walls built perpendicular to the shoreline in an attempt to stabilize the beach and keep sand from moving. (These walls are not built to protect a harbor entrance.)

Geologists have used radiometric dating to determine that the earth is ____ years old

Meandering rivers make bad state boundary lines because they are constantly shifting their location. In time, a meander bend may be cut off and form a crescent-shaped _____ lake. 

According to the textbook, the largest oil reserves in the world are located in _____.