Name solid form of water.

Answer

**Step-by-Step Solution:**

1. **Understanding Water States**: Water exists in three states: solid, liquid, and gas. The solid state occurs at low temperatures.

2. **Identifying the Solid Form**: The solid form of water is specifically identified when the temperature falls below 0 degrees Celsius.

3. **Naming the Solid Forms**: The two common solid forms of water are:
- **Ice**: This is the most recognized solid form, typically found in frozen lakes, ice cubes, etc.
- **Snow**: This is another form of solid water that falls from the atmosphere as precipitation in cold weather.

4. **Conclusion**: Therefore, the solid forms of water are ice and snow, both of which occur at temperatures below 0 degrees Celsius.

**Final Answer**: The solid form of water is ice or snow.

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