Download homework-igneous-rock-5.1-5.2

Name_______________________________________________________________________ Date__________________________________ Hour ____________
Igneous Rock Section 5.1 pages 112-117
Read and complete each statement.
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Molten rock inside Earth’s crust is called _______________________________________________________________________.
A(n) __________________________________________________________________ is formed from the crystallization of magma or
lava.
Magma that flows out onto Earth’s surface is called ________________________________________________________________.
For each statement below, write true or false.
___________________________4. Magma is often a slushy mix of molten rock, gases and mineral crystals.
___________________________5. Silica is the most abundant compound found in magma.
___________________________6. Magmas are classified as basaltic, andesitic, or rhyolitic.
___________________________7. In the laboratory, rocks must be heated from 8000oC to 12000oC before they melt.
__________________________ 8. Heat in the upper mantle and lower crust may come, in part, from the decay of radioactive
elements.
Section 5.2 pages 118-123
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When magma cools and crystallizes below Earth’s surface it is called ________________________________________________.
When lava cools and crystallizes on Earth’s surface it is called ________________________________________________________.
What are the two classifications of igneous rock according to their mineral compositions?
____________________________________________and ________________________________________________.
Explain the silica content of basaltic and granitic rocks. ________________________________________________________________
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What are the two types of texture for igneous rock? __________________________________ and ____________________________.
Explain what happens to lava that cools on the Earth’s surface. What type of crystals are formed? Give two
examples of this type of rock. ____________________________________________________________________________________________
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Explain what happens to magma that cools below the Earth’s surface. What type of crystals are formed? Give
two examples of this type of rock. _______________________________________________________________________________________
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What causes minerals to form both large and small crystals in the same rock? ______________________________________
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Explain how vesicular rocks are formed. Give an example. ____________________________________________________________
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