Question

Identifying Physical Properties of Matter
Sand is made of tiny pieces of rock that have been worn down by wind and water. Explain why the formation of sand is a physical change.

Answer 1

Answer:

When a rock gets hot it expands a little, and when it gets cold the rock contracts a little. If a rock is heated and cooled many times, cracks form and pieces of rock fall away. This type of physical weathering happens a lot in deserts, because it is very hot during the day but very cold at night.

Explanation:

Answer 2

Answer:

The particles of rock are rearranged.

The sizes and shapes of the rocks are changed.

The identities and total mass of the rocks remain the same.

A physical change is a change in some of the physical properties of matter, but not its identity.

Explanation:2020

WFH 8th Gr PhySci_20-21