Why are carbon dioxide, methane and oxides of nitrogen called greenhouse gases?

Explanation

**Step-by-Step Text Solution:**

1. **Understanding Greenhouses:**
- A greenhouse is a structure primarily made of glass that allows sunlight to enter while trapping heat inside. This design helps to maintain a warm temperature and controlled humidity, which is beneficial for the cultivation and protection of plants.

2. **Function of a Greenhouse:**
- The glass walls of a greenhouse trap solar energy. When sunlight enters, it warms the interior, creating a suitable environment for plants to grow, even if the external temperature is cold.

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