Primary atomsphere contained

Options

A. `CO_2,NH_3" and "H_2O`
B. `CH_4,NH_3,H_2" and "H_2O`
C. `CO_2,N_2,H_2" and "H_2O`
D. `CH_4,CO_2,N_2,O_2" and "H_2O`

Answer

To answer the question regarding the composition of the primary atmosphere of Earth, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Primary Atmosphere**: The primary atmosphere of Earth refers to the original gaseous envelope that surrounded the planet during its early formation. It is essential to recognize that this atmosphere was different from what we have today.

2. **Nature of the Primary Atmosphere**: The primary atmosphere was reducing in nature. This means that it lacked free oxygen (O2) and was conducive to chemical reactions that would not occur in an oxidizing environment.

3. **Identifying the Gases Present**: The primary atmosphere primarily consisted of:
- **Methane (CH4)**: A simple hydrocarbon that was abundant in the early atmosphere.
- **Ammonia (NH3)**: A compound of nitrogen and hydrogen, also prevalent in the early atmosphere.
- **Hydrogen (H2)**: The lightest and most abundant element in the universe, which was a significant component of the primary atmosphere.
- **Water Vapors (H2O)**: Water in vapor form was also present, contributing to the atmosphere.

4. **Exclusion of Other Gases**: It is crucial to note that the primary atmosphere did not contain significant amounts of:
- **Oxygen (O2)**: Its absence is what made the atmosphere reducing.
- **Carbon Dioxide (CO2)**: Although it is a common component of the current atmosphere, it was not a significant part of the primary atmosphere.

5. **Conclusion**: Based on the information gathered, the correct answer to the question is that the primary atmosphere contained Methane, Ammonia, Hydrogen, and Water Vapors.

### Final Answer:
The primary atmosphere of Earth contained Methane, Ammonia, Hydrogen, and Water Vapors.

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