Radiant heat from the sun enters the greenhouse through glass or plastic windows. The heat is absorbed by the ground, plants and other items in the greenhouse. This heat is then trapped and concentrated within the enclosed space.
About this Author
Located in Jacksonville, Fla, Frank Whittemore has been a writer and content strategist for over 15 years, providing corporate communications services to Fortune 500 companies. Whittemore writes on topics that stem from his fascination with nature, the environment, science, medicine and technology.