Ch 18 Review.

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Presentation transcript:

Ch 18 Review

Which of the following does NOT play a role in magma formation? A) temperature B) pressure C) water D) tephra

Which of the following is TRUE. A) Increased pressure = higher melting point B) Decreased pressure = higher melting point C) Increased water = higher melting point D) Increased pressure = lower melting point

Which of the following melts to form rhyolitic magma? A) Continental crust B) Oceanic crust C) Oceanic sediment D) The upper mantle

Which of the following melts to form andesitic magma? A) Continental crust B) Oceanic crust C) Oceanic sediment D) The upper mantle B and C

Which of the following melts to form basaltic magma? A) Continental crust B) Oceanic crust C) Oceanic sediment D) The upper mantle

Which type of pluton is completely parallel to the surrounding rock layers? A) dike B) sill C) laccolith D) stock

The Hawaiian volcanoes formed as a result of which of the following? A) divergence B) A hot spot C) subduction D) convergence

Which of the following is NOT true? A) More silica increases viscosity B) Andesitic lava has intermediate gas content and explosiveness C) Increased temperature increases viscosity D) Basaltic magma has low viscosity and little gas.

Put these in order from smallest to largest: Lapilli, dust, volcanic blocks, ash dust, ash, lapilli, volcanic bock

Which of the following has a broad, gently sloping sides and a circular base? A) Hot spot B) Composite cone C) cinder-cone volcano D) Shield volcano

What type of volcano is each one? Shield B Composite C Cinder cone

How is each made? Layer upon layer of relatively thin basaltic lava Ejected volcanic material piles up Volcanic fragments with alternating layers of lava

Which number is the… Sill Dike Batholith Laccolith Volcano

What to STUDY for the test! Chart on pg 474 Ch 18 Vocabulary Ch 18 GRWs Ch 18 Notes Ch 18 Section Reviews GOOD LUCK!

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