Name the gases that were found in primitive earth's atmosphere.

Explanation

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

1. **Understanding Primitive Earth**: The Earth is estimated to be around 4.5 billion years old. In its initial phase, the surface of the Earth was molten and did not have a stable atmosphere.

2. **Formation of Gases**: As the molten surface cooled down, various gases began to form. The primary gases identified in the primitive atmosphere include:
- **Carbon Dioxide (CO2)**: A significant component of the early atmosphere.
- **Water Vapor (H2O)**: Released as the surface cooled and water began to condense.
- **Methane (CH4)**: Another important gas present in the early atmosphere.
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