Transcript Document
Rock Cycle Webquest *Make corrections and additions using colored pen! Key Characteristics Sedimentary 1. Fossils 2. Sand and pebbles Metamorphic 1. Ribbon-like layers 2. Crystals Igneous 1. Gas bubbles 2. Glassy surface • What type of rock is deposited in layers? Sedimentary • What is the only type of rock that contains fossils? Sedimentary • What type of rock only forms under Earth’s surface? Metamorphic • What type of rock forms both on and under the Earth’s surface? Igneous Examples Sedimentary 1. Conglomerate 2. Limestone Metamorphic 1. Gneiss 2. Marble Igneous 1. Basalt 2. Obsidian Heat & Pressure • The further you descend into the Earth, the temperature… increases! • Before a rock reaches its melting point it changes into a… metamorphic rock! • What causes the pressure that changes rocks? The weight of the overlying rocks Melting • At what temperature does rock melt (in Fahrenheit)? 1,100 – 2,400 degrees Fahrenheit • When a rock melts it turns into a molten rock called… magma! Cooling 1. Lava on the Earth’s surface that cools quickly, forming igneous rock. Extrusive 2. Magma under the Earth’s surface that cools slowly, forming igneous rock. Intrusive Cooling • What is the difference between magma and lava? Both are melted rock! The difference is location! Magma = below Earth’s surface Lava = on Earth’s surface Weathering & Erosion • The breaking down of rocks is called… weathering • Environmental factors that cause the breakdown of rock: 1. Water 2. Wind 3. The Sun 4. Temperature Changes Weathering & Erosion • The bits and pieces of material broken off of a rock are called… sediments • The transportation of sediments is called… erosion • Things that transport sediments: 1. Wind 2. Water Compacting & Cementing • Typically, sediments are deposited and accumulate in… 1. Oceans 2. Lakes 3. Valleys • How are sediments compacted (pressed) together? Overlying sediment layers weigh down the sediment beneath, pressing the sediment together Compacting & Cementing • Haw are sediments cemented (glued) together? Dissolved minerals in water pass in between the sediments, gluing them together • The compaction and cementation of a sediment forms a… sedimentary rock!