Small city, BIG ammenities! That is Hidalgo, Texas. The City of Hidalgo is located on lands settled by Spanish -colonizer Jose de Escandon in 1749, as an adjunct to the new settlement of Reynosa, both part of colonial Spain until 1821. The desert settlement was mainly involved with cattle grazing for some 150 years.
When something changes phase from solid to liquid, or from liquid to gas, it takes energy to break the intermolecular interactions. These interactions between the water molecules are what make it solid. When you have ice, these interactions are strongest, which is why ice is hard.
Energy Involved in Phase Change. Now, here's the weird thing about this diagram. Notice that at stage II and IV, when a substance hits its melting point and boiling point, no change in temperature happens. Energy is still being added to the substance, but the temperature doesn't increase.