Write two different ways of harnessing enegry from ocean.

Explanation

**Step-by-Step Solution:**

1. **Identify the Question**: The question asks for two different ways to harness energy from the ocean.

2. **First Method - Tidal Energy**:
- **Definition**: Tidal energy is generated by the gravitational pull of the moon and the sun on the Earth's water bodies, which causes tides (high and low).
- **How it Works**: To harness tidal energy, we can construct tidal barrages or dams across estuaries. As the tide rises and falls, water flows through turbines in the dam, generating electricity.

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