Name_____________________
Igneous Rock ID Lab
Using your “Dichotomous Key for Igneous Rocks”, identify the numbered rock samples.
On your data table, include the rock name, type of igneous rock and identifying characteristics.
Rock Sample
Number
1
Rock Name
Intrusive
(Cooled Slowly)
Extrusive
(Cooled Quickly)
Formed from
Magma or Lava
2
3
4
5
6
7
Name_____________________
Igneous Rock ID Lab
Using your “Dichotomous Key for Igneous Rocks”, identify the numbered rock samples.
On your data table, include the rock name, type of igneous rock and identifying characteristics.
Rock Sample
Number
1
2
3
4
5
6
7
Rock Name
Intrusive
(Cooled Slowly)
Extrusive
(Cooled Quickly)
Formed from
Magma or Lava
Analysis:
1.
Make a general statement about how igneous rocks are formed. Use evidence from the investigation to help you
write your statement.
____________________________________________________________________________________________________
____________________________________________________________________________________________________
____________________________________________________________________________________________________
2.
Explain how the cooling rate of molten material affects the formation and the grain size of igneous rocks. Provide
examples from the investigation to support your response.
____________________________________________________________________________________________________
____________________________________________________________________________________________________
____________________________________________________________________________________________________
3.
Which igneous rock was the easiest for you to identify? Why?
____________________________________________________________________________________________________
____________________________________________________________________________________________________
4.
Which igneous rock was the most difficult for you to identify? Why?
____________________________________________________________________________________________________
____________________________________________________________________________________________________
Analysis:
1.
Make a general statement about how igneous rocks are formed. Use evidence from the investigation to help you
write your statement.
____________________________________________________________________________________________________
____________________________________________________________________________________________________
____________________________________________________________________________________________________
2.
Explain how the cooling rate of molten material affects the formation and the grain size of igneous rocks. Provide
examples from the investigation to support your response.
____________________________________________________________________________________________________
____________________________________________________________________________________________________
____________________________________________________________________________________________________
3.
Which igneous rock was the easiest for you to identify? Why?
____________________________________________________________________________________________________
____________________________________________________________________________________________________
4.
Which igneous rock was the most difficult for you to identify? Why?
____________________________________________________________________________________________________
____________________________________________________________________________________________________
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Igneous rock lab chart

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