Ghulan, Sheeta, and Sara chose their hiding places based on the material properties. Ghulan hid behind a wall because it is opaque, making him completely hidden. Sheeta hid behind a big tree, another opaque object, and Sara hid behind frosted ...
Tiwari Academy Discussion Latest Questions
When using a metal key to scratch different materials, some like wood and chalk may scratch easily due to being softer, while others like iron or stone may be much harder to scratch due to their greater hardness.
The hardness of materials is relative. For example, rubber is harder than sponge but softer than iron, indicating that hardness depends on what the material is being compared to.
Some materials are easier to scratch because they have a softer surface, which makes them more susceptible to being marked or damaged by harder objects.
The property is called hardness. Materials that can be easily compressed or scratched are considered soft, while those that are difficult to compress or scratch are considered hard.