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.
water   Water is a gas when it is steam. It condenses to liquid, becoming water. It becomes solid when it freezes, and then becomes liquid again as it melts.The entire pro â¦ cess depends on temperature. The molecular structure of water does not change throughout all these changes.f u boil a solid,it will become liquid. If u continue to heat the Liquid,it will evaporate and become steam at a particular temperature. 8 people found this useful. Edit. Share to: The question and answer are locked and cannot be edited.