Key learning points

1. The physical properties of a material are its features that can be observed or measured.
2. Hardness is a physical property of rocks.
3. Rocks can be compared and grouped on the basis of their hardness.

Keywords

• Rock - Rock is a solid material that occurs naturally in Earth.

• Physical properties - Physical properties are the features which can be observed from the way an object looks or feels or can be measured.

• Hardness - Hardness is the quality of being difficult to bend, cut, or break.

• Compare - To compare is to examine or look for the difference between two or more things.

• Group - To group is when a number of people or things are put together.

Common misconception