Objects that contain iron are attracted to magnets. Look at the flasks with iron filings and magnets inside then let the students describe how they could test for iron in the mineral samples. Then let them try it. Rocks are classified into three main groups depending on how they are formed. Sedimentary rocks are made from sand and silt that have been pressed together into layers.
Igneous rocks are rocks that became so hot that they melted, then cooled down and solidified again.
Metamorphic rocks are sedimentary or igneous rocks that have been altered by the action of heat or pressure. There are many ways that rocks can be changed. Igneous rocks beneath or on the Earth's surface are constantly subjected to physical and chemical conditions that change them. As a result of these changes, sedimentary rocks, metamorphic rocks, or new igneous rocks are formed. Students should be able to describe and characterize different types of common rocks, use a guidebook to identify rocks and minerals and be aware of the many uses for rocks and minerals in today's world.