Final answer:
The three basic types of coverings for greenhouses are glass, plastic film, and polyethylene. These coverings trap solar radiation to create a warm and controlled environment for plant growth.
Step-by-step explanation:
The three basic types of coverings for greenhouses are:
- Glass: Glass coverings are commonly used in greenhouses. They trap solar radiation released from the sun as it reaches the Earth's surface and allow it to enter the greenhouse. This helps create a warm and controlled environment for plants.
- Plastic film: Plastic film coverings are less expensive and lighter than glass. They are found mostly in greenhouses. Plastic films also trap solar radiation and provide insulation for the plants.
- Polyethylene: Polyethylene sheets are a type of plastic film commonly used in greenhouses. These coverings are durable and provide good insulation. These gases are essential for plant growth in a greenhouse.