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CHAPTER 3: VOLCANOES

CHAPTER 3: VOLCANOES. SECTION 2: PROPERTIES OF MAGMA. How fast lava flows depends on the properties of the magma from which it formed. Like all substances, magma and lava are made up of elements and compounds. Each substance has a particular set of physical and chemical properties.

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CHAPTER 3: VOLCANOES

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  1. CHAPTER 3: VOLCANOES SECTION 2: PROPERTIES OF MAGMA

  2. How fast lava flows depends on the properties of the magma from which it formed. • Like all substances, magma and lava are made up of elements and compounds. • Each substance has a particular set of physical and chemical properties.

  3. The physical property of liquids called viscosity is the resistance of a liquid to flowing. • The greater the viscosity of a liquid, the slower it flows. Honey has a high viscosity. • The lower the viscosity, the more easily a liquid flows. Water has a low viscosity.

  4. The viscosity of magma depends upon its silica content and temperature. • The more silica magma contains, the higher its viscosity. • High viscosity lava produces the rock rhyolite. • Low viscosity lava produces the rock basalt.

  5. Viscosity increases as temperature decreases. • The temperature of magma and lava can range from about 750 oC to 1,175 oC. • Pahoehoe is fast-moving, hot lava that has low viscosity. • Lava that is cooler and slower-moving is called aa.

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