Basaltic - PowerPoint PPT Presentation

Volcanism

Volcanism. Dr. Bob Hickey Department of Geography and Land Studies Central Washington University. Flood Basalts. Flood Basalts. Very low viscosity, high volume. Basaltic (high Mg, Fe; low Si) Fill the low spots on a landscape, generally does not form a ‘volcano’

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Chapter 18- Volcanic Activity

Chapter 18- Volcanic Activity. I. Magma. A. How magma forms 1. All volcanoes are fueled by magma deep beneath Earth ’ s surface. 2. Magma forms when temperatures are high enough to melt the rocks involved. .

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798 views • 46 slides

Volcanoes

Volcanoes. Divergent Boundaries. Click here to view a divergent boundary in action!!. Magma. Type?. Silica?. Explosive?. Magma Formation. Lava. Landform. Plate Tectonics. Where on Earth. DIVERGENT BOUNDARY. LOW. NO. BASALTIC. DECREASE IN PRESSURE. BASALTIC: PAHOEHOE, PILLOW.

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Basaltic (buh SAWL tihk) igneous rocks are dense, dark-colored rocks.

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231 views • 3 slides

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