Ch 4 - 1. Magmais_. YourAnswer:

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1. Magma is _________. Your Answer: completely or partially molten material, which on cooling solidifies to form an igneous rock   2. The origin of magma is well understood. Your Answer: False 3. Igneous rocks that form at depth are referred to as intrusive or plutonic rocks. Your Answer: True 4. Examine this  VolcanoWorld page . What is the difference between a tholeiitic basalt and an alkali basalt? Your Answer: An alkali basalt contains more conspicuous plagioclase and pyroxene crystals.   5. Identify the type of igneous rock you would expect to find at each of the indicated locations by selecting the correct  response.   Label Your Answer: Correct Answer: 5.1 mid-ocean ridge basalt     B.     B.     5.2 recent andesite     C.     C.     5.3 intraplate (hot-spot) basalt     D.     A.     5.4 ancient granite     A.     D.     6. What is meant by “extrusive” and “intrusive”?
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Your Answer: Igneous rocks that cooled at the surface (volcanic) and interior to the surface (plutonic) of the Earth,  respectively.   7. The most common extrusive igneous rock is granite. Your Answer: False   It's basalt. Granite is intrusive anyway.   8. The only factor that determines the texture of an igneous rock is the amount of silica present in the magma. Your Answer:
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Ch 4 - 1. Magmais_. YourAnswer:

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