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

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