Explain anomalous behaviour of water. Write its effect in lakes and ponds.

Explanation

### Step-by-Step Solution:

1. **Understanding Anomalous Behavior of Water**:
- Water exhibits an anomalous behavior, particularly between the temperatures of 0°C and 4°C. Unlike most substances, which expand when heated and contract when cooled, water behaves differently in this temperature range.

2. **Behavior Above 4°C**:
- When water is heated above 4°C, it expands as expected. This means that as the temperature rises, the volume of water increases, leading to a decrease in density.

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