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Igniting Igneous

Igniting Igneous. Classifying Igneous Rocks. Do Now. Behold the samples of rocks up front. Try to place them in the correct box. Essential Question. How is texture and magma composition used to classify igneous rocks?. You will be able to:. Identify igneous rocks based on their texture.

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Igniting Igneous

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  1. Igniting Igneous Classifying Igneous Rocks

  2. Do Now • Behold the samples of rocks up front. Try to place them in the correct box

  3. Essential Question How is texture and magma composition used to classify igneous rocks?

  4. You will be able to: Identify igneous rocks based on their texture. Relate texture of igneous rocks to their magma composition.

  5. Prepare for the Activity • Work in groups of four.

  6. Discussion Notes The basalt, obsidian, pumice, tuff and scoria are examples of extrusive igneous rocks. These rocks erupted at the Earth’s surface through and show a fine-grained to glassy texture due to fast cooling and may have holes that are indicative of gas escaping from the magma. • Igneous rocks are rocks that are formed from volcanic activity. • Depending on whether the magma or lava cools quickly or slowly can determine the texture of the igneous rock. • Depending what minerals are in the rock determines their color.

  7. Discussion Notes (cont.) Because the rocks in the interior of the Earth are poor conductors of heat, it takes a long time for the hot magma to be cooled. Thus, the intrusive igneous rocks have a coarse-grained texture due to their slow cooling. • The gabbro and granite are examples of intrusive igneous rocks. • These are rocks formed from magma that has cooled within the Earth.

  8. Wrap Up • How is texture and magma composition used to classify igneous rocks? • Color is indicative of what minerals made up the igneous rock. • Texture is due to how fast the magma or lava cooled. • Extrusive cools rapidly • Intrustive cools slowly • Mafic igneous rocks typically form under oceans while felsic form on continents. • All igneous rocks form from volcanic activity.

  9. Check-in- Exit Ticket In the northwestern portion of New Castle County, Delaware, there is an exposure of rock that is called the Iron Hill Gabbro. This rock is about 400-500 million years old! Based upon what you have learned about igneous rocks, and what these names infer… 1. Was the Iron Hill Gabbro formed beneath an ocean or beneath a continent? 2. Describe what you think happened to the Iron Hill Gabbro over time so that now it is found in Delaware.

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