How does sediment form? Molten rock cools below Earth’s surface.

Chemical changes cause sediment to cement together.

Loose material is compacted by pressure.

Weathering breaks down rock and other material.

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Loose Material is compacted by pressure.

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the enthalpy of formation of water is given as -285.8kj/mol, which states that the enthalpy of formation is negative.

negative enthalpy of formation indicates that the heat is released during the reaction process. the heat is released from reaction to the surroundings the enthalpy is expressed with a negative sign with the energy given out in the reaction process.

the formation of water takes place by giving out heat which is -285.8 kj/mol.