Weathering is a process in which rock at Earth's ____ is broken down into smaller pieces. ____ weathering breaks rocks into smaller pieces by physical means without changing its chemical composition. ____ weathering breaks down rock into smaller pieces and changes the chemical composition of rocks. Freezing and ____ of water in the cracks of rocks can crack rocks. Carbon dioxide, oxygen, salts and ____ can react with the minerals in rocks to form new substances. This process can weaken rocks.

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