Sedimentary rocks: formed from pre-existing rocks or pieces of once-living organisms.
Metamorphic rocks: transformation of the pre-existing rocks by heat and pressure.
Igneous rocks: form by the cooling of molten magma.
2. What rock did you find the most interesting? Why?
Pumice is the most interesting rock for me because it can float on water.
3. What are grains in the rocks? can you show me?
Grains are individual particle in the rock.
4. What are the crystals in the rocks? can you show me?
Crystals in the rocks are formed when the magma cools down. The size of the crystals depend on how fast the magma cools down.