Question

Scientists classify rocks into three different types. What is the main basis for the classification system they chose?

Answer 1

1. color of the rock
2. shape of the rock
3. how the rock is formed
4. who discovered the rock
that is it

Answer 2

The main basis for the classification system is the way rocks were formed. With these criteria there are three different types of rocks:

• Igneous rocks : formed through the cooling and solidification of magma or lava

• Sedimentary rocks : formed by the accumulation or deposition of small particles

• Metamorphic rocks: formed by the transformation of existing rock types by heating and pressure