This warming is in addition to carbon dioxide's better-known effect as a heat-trapping greenhouse gas. For scientists trying to predict global climate change in the coming century, the study underscores the importance of including plants in their climate models.
It is a physical change. All phase changes are physical, not chemical. The chemical composition of water does not change when it changes from a liquid to a gas, or for that ma â¦ tter, to a solid.
But it is a physical change if you try to boil it in the microwave. Hard boiling an egg is both a physical and chemical change. The physical change is from a liquid to a solid (whites and yolk). However, the physical change is initiated by a chemical change caused by the application of heat. physical -- it's the appearance of the egg that is changing, not actually the chemical things on the inside...