The table shows the properties of some common rocks.
Which rock would be the best to use to make roof tiles?
|Soft, permeable, and easy to crumble||Waterproof (impermeable) and can be split into thin pieces||Heavy, shiny, and waterproof|
The photograph shows molten rock from Earth’s core.
When this rock cools, it sets and makes a new rock.
What type of rock is made this way?
Rocks can be classified according to a hardness scale. The hardest rocks cannot be scratched. Softer rocks can be scratched with a fingernail or a coin.
A class tested four rocks by scratching them with their fingernails, a coin, a knife, and a shard of glass. They recorded their results in the table shown.
Order the rocks from hardest to softest using the results given.