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Transcript
Day 6 All igneous rocks form underground. Is the above statement true or false? Explain. False. Some form on Earth's surface from molten rock that is released when a volcano erupts. Daily Warm-Up Exercises 1 Igneous & Metamorphic Rocks (Part 1, steps 7-15) Investigation 8 One Rock to Another 2 Layers of the Earth Inner Core: •At the center of the Earth •Solid iron and nickel Outer Core: •Surrounding the inner core •Molten iron and nickel Mantle: •Between the crust and core •The most massive part of Earth •Lower part is a soft (plastic) solid Crust: •The thin outer surface of the Earth •The part we stand on •If Earth were an egg, the crust would be the shell 3 Igneous Rocks Extrusive igneous rock forms when lava cools on the surface of the Earth Called lava on the surfacetuff, scoria, examples: obsidian, pumice, basalt Intrusive igneous rock forms when magma cools below the surface of the Earth in the crust example: granite 4 Metamorphic Rocks • Metamorphic means “changed” Called lava on the • Rocks that have changed from other surface types of rock • The change is brought about by pressure and/or heat 5 Metamorphic Rocks Pressure occurs when 1. Rocks are buried deep in the Earth 2. Magma pushes up from below Heat occurs when rocks are covered with magma Heat and Pressure result when rocks are pressed down close to magma 6 Metamorphic Rocks When rocks get so hot that they melt, they turn into magma If magma resolidifies, it is a new igneous rock Metamorphic rocks never completely melt 7 Source and Morph Rocks All metamorphic rocks form from a source rock Source Rock Morph Rock (the original rock that changes) Heat and/or Pressure limestone marble 8 Source and Morph Results Source Morph shale slate shale or mudstone schist sandstone quartzite granite gneiss 9 Essay Question What forces are constantly shaping and reshaping Earth’s surface? (Hint: constructive/ destructive) Earth processes are going all the time. Destructive processes break down landforms. These include weathering, erosion, and tectonic plates sinking and melting. Constructive processes build up. They include mountain building, deposition (sedimentation), and new crust formation. Daily Warm-Up Exercises 10