Volcanoes
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Volcanoes

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Used for a seventh grade earth science class

Used for a seventh grade earth science class

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    Volcanoes Volcanoes Presentation Transcript

    • Volcanoes 101
    • Magma - molten rock under theearthLava - magma that has reachedthe surfaceNon-explosive Eruptions lava flows - rivers of hotlava Lava fountains - sprays oflava from non-explosiveeruptions
    • Is this an explosive or non-explosive eruption?What is this volcanicformation called?
    • Explosive Eruptions - clouds of hot gases, lava and solid rock explodeout of volcanoes at super high speeds
    • Magma compositionWater - The more water the more explosive the volcanowill be, like CO2 in a soda can.Silica - Magma with lots of silica will harden in the ventsand cause a pressure build up and a larger explosion.Less silica means runny lava.
    • Types of lava1. Blocky Lava2. Pahoehoe3. Aa4. Pillow
    • Types of Pyroclastic Material1. Volcanic Blocks2. Volcanic Bombs3. Lapilli4. Volcanic Ash
    • Volcanoes Effect on the Earth1. Flows and Fall out2. Climatic Changes
    • VolcanoesTypes of volcanoes 1. Cinder cones 2. Shield Cones 3. Composite cones orStratovolcanoes
    • Label each volcanoTypes of volcanoes 1. Cinder cones 2. Shield Cones 3. Composite cones orStratovolcanoes
    • Craters Vent Magma ChamberLava Plateaus
    • Caldera
    • Lava Plateau
    • Formation of Magma1. Pressure2. Temperature3. Density
    • Where do volcanoes occur?
    • Prediction of Volcanoes1. Measuring small quakes2. Measuring Slope Tiltmeter
    • 3. Measuring Volcanic Gasses 4. Measuring Temperature from Orbit