A mixture is a combination of two or more substances that are not chemically bonded together. The components of a mixture can be separated by physical means, such as filtration or distillation.

Marbles are made of calcium carbonate, which is a mineral. Sand is made of small grains of rock and minerals. Water is a compound made of hydrogen and oxygen.

When marbles, sand, and water are mixed together, they form a heterogeneous mixture. This means that the mixture is not uniform throughout. The marbles and sand are solids, while the water is a liquid. The marbles and sand will settle to the bottom of the mixture, while the water will remain at the top.

Mixtures can be separated by physical means. For example, the marbles and sand can be separated from the water by filtration. The water can be poured through a filter paper, which will trap the marbles and sand.

Mixtures can also be separated by distillation. This process involves boiling the mixture and then condensing the vapor. The vapor will contain the more volatile components of the mixture, while the less volatile components will remain in the boiling liquid.