'Lower silica content' presentation slideshows

Chapter 7 Fires Within: Igneous Activity

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Chapter 7 Fires Within: Igneous Activity

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Chapter 7 Fires Within: Igneous Activity

514 views • 41 slides

VOLCANIC Magma Types

Chapter 18. VOLCANIC Magma Types. Introduction (1)?. ~ 1,500 active volcanoes on Earth 400 erupted in the last century ~ 50 eruptions per year Most activity concentrated along major plate boundaries Impact risks depend on the types of volcanoes. Introduction (2)?.

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Igneous Rocks

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Igneous Rocks

Igneous Rocks. How do igneous rocks form?. From the crystallization of magma. Magma can cool in two places. On the surface of the Earth ( Extrusive igneous rock) Crystal or grain size? Ex= rhyolite Below the surface of the Earth ( Intrusive igneous rock)

397 views • 22 slides