High specific heat means it takes a lot of heat to change the temperature of water. Why is the specific heat of water so high?

It takes a lot of heat energy to break the bonds between the Hydrogen and Oxygen atoms of individual water molecules.

It takes a lot of heat energy to break all of the hydrogen bonds that form between water molecules.

It takes a lot of heat energy to overcome the bonds that water forms with other substances.

All of the above reasons contribute to the high specific heat of water. The bonds between hydrogen and oxygen within each water molecule, as well as the hydrogen bonds that form between water molecules, all require a significant amount of heat energy to break. These bonds are responsible for the unique properties of water, including its high specific heat.