You can use the characteristics(color, luster, streak, hardness, cleavage, fracture, and crystal).
When it has holes and small rocks inside the rock
igneous rocks
Igneous rocks are used as building materials for construction (e.g. granite countertops), crushed stone for roads and landscaping, and as a source of minerals for industrial purposes such as in the production of ceramics.
Rhyolititcen rocks.
Igneous rocks are formed by the solidification of molten materials.
Sedimentary rock can be made up partially of igneous clasts, but igneous rock is igneous rock.
All rocks can become igneous rocks. With weathering and erosion, an igneous rock can become a sediment. Then with compaction and cementation, it can become a sedimentary rock. With heat and pressure, it will turn into a metamorphic rock. Or it can melt and turn into an igneous rock. There are many more ways rocks can change types... that is the rock cycle.
2*2
Igneous rocks
Yes. Volcanic rocks are extrusive igneous rocks.
No, igneous rocks are harder than sedimentary rocks on average.
sedimentary,metormorphic , igneous .........