Chapter 9 Volcano AND1) Refers to the opening in earth’s crust through which molten rock, gases and ash erupt AND 2) the landform that develops around.

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Presentation transcript:

Chapter 9 Volcano AND1) Refers to the opening in earth’s crust through which molten rock, gases and ash erupt AND 2) the landform that develops around that opening

Where??? Where do volcanoes occur? 1) At subduction boundaries

2 at divergent boundaries

3 – Over hot spots Hot spot??? Areas of volcanic activity that results from hot material that rises up in the mantle Hot spots don’t move….the PLATE does!

Types of Magma Viscosity Gas content Resistance to flow (THICK!) More gas = more EXPLOSIVE

Lava Flows Pahoehoe Aa Pyroclastics Pillow lava Smooth Jagged Solid fragments underwater

Types of Volcanoes Shield Cinder Cone Composite Caldera Broad, gentle slopes (Mauna Loa) Small….normally around composites Very large and steep (Mount Shasta) An extinct volcano that has filled with water

Largest Volcano in our Solar System!

Oylmpus MonsMars