Rocks are solid, natural aggregates of minerals, with glass also present in
many volcanic types. Minerals combine in different ways to make rocks. Minerals
are the words in Earth's history book: In each rock, they tell a different story.
Three Rocks and Their Minerals
All Rocks Contain Water
Zap! Lightning created this lodestonea natural, permanent magnet.
Steel paper clips cling better to areas where the strongest current traveled.