Contracts are formed when water is:

🧠 Explanation:

When water is cooled below 4°C, it contracts until reaching 4°C, then expands as it cools further toward 0°C due to its unique density behavior. This anomaly, studied in physics and chemistry, occurs because water’s density peaks at 4°C, causing it to expand as it forms ice. This expansion affects natural processes like lake freezing and engineering applications like pipe design. Understanding water’s behavior is key in environmental science and infrastructure, highlighting its role in ecosystems and technology, ensuring accurate planning for cold climates and water-related systems.