http://www.classzone.com/books/earth_science/terc/content/investigations/es0603/es0603page01.cfm
Inquiry 21.1: Igneous Rocks
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1) Describe the 4 igneous rocks shown in the images
Sample #1
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Sample #2
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Sample #3
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Sample #4
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2) Draw a line to match each type of Igneous Rock Texture with its description.
Fine-grained texture
grains visible to the naked eye
Porphyritic texture
2 different grain sizes
Coarse-grained texture
need magnification to see individual grains
3) Identify the texture of each of these igneous rocks as Coarse-grained, fine-grained, or
Porphyritic. Record your answers in the table.
Sample #1
Sample #2
Sample #3
Sample #4
Sample #5
Sample #6
4)
Identify the Cooling Rate (fast, slow or two-staged) and the Cooling Environment
(magma chamber, eruption from volcano, or deep-cooling followed by eruption) of the
rock in each image. Record you answers in the table.
Sample #1
Sample #2
Sample #3
Sample #4
Sample #5
Sample #6