Answer:
2. The sand simply settles down at the bottom of the water container. This is because sand is heavier than water and hence cannot float in water.
3. A suspension is a mixture of two substances, in which a solid is dispersed, undissolved, in a liquid.
4. a physical change occurs. The coffee solids are dissolved and suspended in the water. Physical changes can often be reversed, while many chemical changes cannot be reversed.
