Rocks (Blastoff! Readers: Earth Science Rocks!) (Earth Science Rocks! Blastoff Readers, Level 3)

Scientists categorize rocks into three different groups depending on how the rock was formed. Humans have used rocks from all groups as tools and in construction for thousands of years. Readers will be amazed to learn how heat, pressure, magma, and even water bring minerals together to form these useful compounds in this elementary title.