Which of these is an example of physical weathering? 1) Blowing away of lighter rock particles

2) Rock breaking up due to carbonic acid

3) Rock breaking up due to mechanical force

4) Settling down of rock particles in a new location

The answer is 3) Rock Breaking up due to mechanical force

Hope that help :)

||-//

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.