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Homework: Impact of Earthquake Board due 11/4 (A) & 11/7 (B) Warm Up 22: 1. Choose the right word for this sentence: The core is more/less dense than the crust. Explain your answer. 2. Which type of rock forms underground from extreme heat and pressure? Metamorphic Rock • Forms when existing rock is exposed to high heat, high pressure, or both. • Examples: marble and gneiss • Usually happens deep in Earth and at plate boundaries. Marble Igneous Rock • Forms when melted rock (magma/lava) cools and hardens • Examples: granite and pumice • When an igneous rock is intrusive (cools below Earth’s surface) it has large crystals. When it is extrusive (cools above ground) it has small crystals. Pumice Sedimentary Rock • Forms when layers of sediment build up over time and are pressed together from the weight of the layers. • Examples: limestone and sandstone • Sedimentary rock has layers Sedimentary Rock • Weathering- breaks rocks into sediment (small pieces of rock) • Erosion- moves sediment usually by wind or water • Deposition- drops sediment Sandstone