Panes of glass/plastic and metal, usually. The terminology for greenhouse gases comes from the idea that the gases, like the glass of a greenhouse, trap heat within through a selectivity of the portions of the spectrum that can pass through the barrier, heating the contents inside.
A greenhouse is essentially a structural frame supporting large cover panes that make up the walls and roof. Frames can be made of galvanized steel, other sturdy metals like aluminum, or wood, with many frames being constructed with two or more types of material. The greenhouse covering is traditionally clear glass, which allows large amounts of light and heat to pass through before being trapped inside. High-grade fiberglass can also be used; it’s stronger and more lightweight than glass, but can sometimes discolor and reduce light penetration.
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