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Properties of Magma

Properties of Magma. 7.2 p. 205-208. Properties of Magma. Magma and lava are made up of elements and compounds. Elements are substances that can’t be broken down into a simpler substance. A compound is a substance that’s made up of 2 or more elements that are chemically combined.

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Properties of Magma

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  1. Properties of Magma 7.2 p. 205-208

  2. Properties of Magma • Magma and lava are made up of elements and compounds. Elements are substances that can’t be broken down into a simpler substance. A compound is a substance that’s made up of 2 or more elements that are chemically combined. • The compounds and elements that are in lava and magma and the amounts of each tell us how the material behaves.

  3. Physical Properties • In magma and lava a physical property that is important is viscosity. A physical property is a characteristic of that substance that can be observed without changing the substance. Viscosity measures the ability of a liquid to FLOW. • High viscosity: slow flow rates EX: honey • Low viscosity: flows quickly EX: water

  4. What affects the viscosity of the liquid is the friction between the particles: the higher the friction the higher the viscosity and the slower the particles move. • Magma’s viscosity depends on the amount of silica and the temperature of the magma or lava.

  5. Silica Content • Silica is particles of oxygen and silicon combined. The more silica in the magma the higher the viscosity and the slower the flow. (very sticky and light colored, forms the rock rhyolite) • The less silica the magma has the lower the viscosity and the faster it will flow.( dark colored and forms into basalt)

  6. Temperature and magma • The higher the temperature the more the lava will flow. ( low viscosity) • The lower the temperature the slower the magma will flow. (High viscosity) • Most magma ranges in temp from 750 C to 1175 C. • Pahoehoe- is a type of lava that is fast moving and hot looks like wrinkles and rope-like coils. • Aa- is a slow moving, cool type of lava that forms rough jagged-looking rocks when it cools.

  7. Viscosity • Viscosity Video • Now you try it!

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