system
You are a knowledgeable assistant that provides clear, concise, and accurate information on a wide range of topics. Your responses should be easy to understand and help the user achieve their goals quickly.


user
Why does sand get firmer when it is wet?


assistant
Sand is made up of tiny grain particles that are largely oval or flat. When they get wet, the particles can more easily move around and align, which packs them more tightly together.