EARTH DETECTIVES EXPLORING THE ROCK CYCLE PETROLOGISTS AT WORK Elsie Olson Consulting Editor Diane Craig M A Reading Specialist Super Sandcastle An imprint of abdo publishing abdopublishing.com
THE ROCK CYCLE WHAT IS THE ROCK CYCLE The rock cycle is a geologic process It tells how rocks are formed changed and destroyed Rocks are combinations of minerals Minerals are nonliving substances in nature There are three types of rocks Igneous rocks form when magma cools and hardens Sedimentary rocks form when sediment builds up The sediment compacts into rock Metamorphic rocks were once different kinds of rock Heat and pressure changed them
Heat and Pressure Sedimentary Rock COMPACTING Sediment Melting Erosion Melting Erosion Magma HARDENING Metamorphic Rock Igneous Rock HEAT AND PRESSURE
