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Caves are usually formed by _____ of limestone.

The Old Man of the Mountain, the symbol of New Hampshire portrayed on the U.S. quarter coin was destroyed in 2003 due to _____.

It would be more risky to build a house on the outside of a river meander, at the _____, because the deeper water there will erode the bank back through time.

The Mississippi River has a _____ delta that moves sediment far out into the Gulf of Mexico. Unfortunately, the Mississippi River also carries agricultural fertilizers, which dump into the Gulf and create a Dead Zone for marine life.

Used nuclear waste fuel rods are presently _____.

The Old Man of the Mountain, the symbol of New Hampshire portrayed on the U.S. quarter coin was destroyed in 2003 due to _____.

Soil _____ is the slowest type of mass wasting and may cause bent tree trunks and leaning fences. It may also crack house foundations, driveways, and walls.

Caves are usually formed by _____ of limestone.

EPA’s Superfund program was set up as a result of _____.

EPA’s Superfund program was set up as a result of _____.