'Lava delta' presentation slideshows

INTRODUCTION: HOW DO VOLCANOES ERUPT? 1.) Heated material from deep (asthenosphere/mantle)

INTRODUCTION: HOW DO VOLCANOES ERUPT? 1.) Heated material from deep (asthenosphere/mantle) rises as solid 2.) magma is created by decompression (lessening of pressure) 3.) increasing water content lowers melting point further 4.) gasses come out of solution-expands BANG-Soda analogy

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