Match the following. Match the items in the left column to the items in the right column. 1. delta
substance which enables the transport of weathered rock and sediment
2. deposition
triangular deposition of fine, fertile soil at the mouth of a river
3. erosion
transport and deposition of weathered rock
4. medium
placement of weathered rock and sediment by erosion

the population of unionid mussels in the hudson river decreased after zebra mussels were introduced. zebra mussels, a nonnative species, competed with the unionid mussels for food. the zebra mussels were able to outcompete the unionid mussels, allowing the zebra mussel population to increase dramatically over six years. the unionid mussel population decreased due to a lack of food.

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