'Igneous Rock Lab' Geography Worksheet
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1
2Name __________________
Date ____________
Class __________
Igneous Rock Lab
Problem: How can you tell the difference between intrusive and extrusive igneous rocks?
Hypothesis: _______________________________________________
Materials: Diorite, olivine, granite, rhyolite, basalt, obsidian, magnifying glasses
Instructions:
1. Divide the rocks into two categories: intrusive
and extrusive
(large crystals, coarse grained)
(no
crystals, fine grained).
2. Place the rocks in the proper row from lightest to darkest.
S6CS1.a Understand the
importance of—and
3. After you have placed the rocks in their proper places,
keep—honest,
clear, and accurate
Name the rocks and label.
records in science.
Outline/label the blocks with felsic rocks with a red marker.
S6E5.b Investigate the
composition of rocks in
Outline/label the blocks with mafic rocks with a blue marker.
terms of minerals.
Outline/label the blocks with intermediate rocks with a yellow
S6E5.c Describe
processes that change
marker.
rocks and the surface
of the earth.
Data Table/Observations:
Intrusive rocks
(coarse grained)
Extrusive rocks
(Fine grained)
Color
Lightest
Middle
Darkest
» » » » » » » » » Silica content decreases » » » » » » » » »
» » » » » » » » » Rock color becomes darker » » » » » » » » » »
Don’t forget to answer the questions on back.
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