Igneous rocks sedimentary rocks and metamorphic rocks make up the three main types of rocks. But did you know that rocks are constantly being created destroyed and created again? Or that rocks are changed by weather erosion heat and pressure? See the rock cycle in action in this fascinating book.
"Flowering plants, cone-bearing plants, ferns, and mosses make up the four main plant groups. ... This ... book investigates the life cycles of each of the four main plant groups"--Back cover.