Precipitation resulting from pollution condensing in clouds and falling to Earth

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Agent

A cause of change

Example: Water is an agent of erosion

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Constructive Forces

Forces that cause helpful changes to Earth 

Example: The breaking of rock to create new soil

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Deposition

The process of dropping, or depositing, sediment in a new location

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Destructive Forces

 Forces that cause harmful changes to Earth

 Example: Weathering and erosion carry away rich farm soil, clog ditches and streams with dirt, and cause flooding

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Erosion

The movement of weathered materials by agents (water, wind, or ice)

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Glacier

A large mass of ice that moves slowly over a land area; does not melt in summer; formed U-shaped valleys

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Gradual

Happening by small steps or degrees; moving little by little; changing step by step

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Weathering

The process of breaking rock into soil, sand, and other tiny pieces called sediment

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