Inside Earth Chapter 3.3 Pages

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Presentation transcript:

Inside Earth Chapter 3.3 Pages 103-107 Volcanic Landforms Inside Earth Chapter 3.3 Pages 103-107

Shield Volcano Shield Volcano: a wide base mountain with very gentle slopes Lava pours out in thin layers and harden on top of older layers. Viscosity = Low ? 2

Viscosity Viscosity Viscosity is a substance’s resistance to flow How much a substance tries NOT to flow “Go with the flow” vs. “Going against the flowing”

Cinder Cone Cinder Cone: steep, cone-shaped hill or mountain May produce ash, cinders and bombs Paricutin in Mexico (424m high) Viscosity = High 4

Composite Volcano Composite: gently steeping, cone-shaped volcano which alternates eruptions of lava flows and violent eruptions (ash, cinder and bombs) Viscosity = High/Low Examples: Mt. St Helens, Mt. Fuji in Japan

What are the 3 types of volcanoes? Describe one of them. Exit Pass What are the 3 types of volcanoes? Describe one of them.

Lava Plateau High, level areas formed by lava flows Thin lava floods out, travels far before cooling & solidifying Flooding process repeats again & again, building up high plateaus over millions of years Columbia Plateau (Washington, Oregon, & Idaho) 7

Caldera Massive eruption empties the main vent and magma chamber beneath the volcano The hollow mountain then collapses inward due to lack of support A Caldera is the large hole left behind Fills with pieces of the volcano, ash and water Crater Lake in Oregon 8

Soils from Lava & Ash Ash releases potassium, phosphorus, nitrogen, and other materials that plants need Soil develops and plants are able to grow 9

Volcanic Neck Forms from when magma hardens in a volcano’s pipe The softer rock wears away, exposing the hard rock (weathering and erosion) 10

Sill Magma that squeezes in between layers of rock and solidifies (Horizontal like a window sill) Which letter shows the sill? B in the diagram A B C D 11

Dike Hans Brinker, The Silver Skates 12

Dike Magma that forces itself across rock layers and solidifies (Vertical cuts through rock layers) Which letter shows the dike? C in the diagram A B C D 13

Batholith Large rock masses that form the core of many mountain ranges Formed when a large body of magma cools inside the crust Which is batholith? D in the diagram. A B C D 14

Dome Mountain Formed by smaller bodies of magma, when rising magma is blocked by horizontal layers of rock. Forces rock layers to bend upward into a dome shape. Rock layers above eventually erodes and leave the core exposed. 15

What are 2 types of volcanic landforms? Describe one of them. Exit Pass What are 2 types of volcanic landforms? Describe one of them.

What to Work On Answer Section 3.3 Review questions on page 107 (#s 1-3) Read and Outline Chapter 3.4, Volcanoes in the Solar System