â My partner and I had a long talk over breakfast this morning about term life insurance. We weighed the pros and cons and found ourselves wanting to talk to an expert on the matter. Was this Helpful?
Rocks are used all around us in many different ways. In the classroom, students use rocks everyday. Graphite, a metamorphic rock, is the part of the pencil used for writing.Slate, another metamorphic rock, was used to make blackboards in years past.Now most blackboards are constructed of man-made materials. Chalk is a soft form of limestone which is a sedimentary rock.ocks are used all around us in many different ways. In the classroom, students use rocks everyday. Graphite, a metamorphic rock, is the part of the pencil used for writing.
The rocks listed in the table above are the most common igneous rocks, but there are actually more than 700 different types of igneous rocks. Granite is perhaps the most useful one to humans. We use granite in many building materials and in art. As discussed in the introduction to this lesson, pumice is commonly used for abrasives.