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Identifying Igneous Rocks

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Identifying Igneous Rocks Answer Key

1. 
Use the identification chart for igneous rocks to answer the questions.
Chart - Igneous Rocks
A. 
Which of the following igneous rocks has large crystals, forms inside Earth, and has a high mineral composition of iron and magnesium?
  1. pegmatite
  2. peridotite
  3. granite
  4. scoria
B. 
Mitchell is trying to identify an igneous rock sample and has narrowed it down to basalt or scoria. According to the chart, which property should Mitchell use to determine the name of the rock?
  1. color
  2. texture
  3. density
  4. composition
C. 
Which of the rocks listed on the chart has the largest crystal size?
  1. dunite
  2. obsidian
  3. pegmatite
  4. basaltic glass
D. 
According to the chart, diorite and andesite differ in
  1. density and texture.
  2. composition and density.
  3. texture and formation environment.
  4. formation environment and composition.
E. 
Diabase is                 dense than granite and has a coarser texture than                .
  1. more; basalt
  2. more; gabbro
  3. less; basalt
  4. less; gabbro
2. 
What rock is shown?
Rock - Igneous - Granite
  1. scoria
  2. gabbro
  3. granite
  4. andesite
 
3. 
What rock is shown?
Rock - Igneous - Basalt
  1. scoria
  2. basalt
  3. gabbro
  4. rhyolite
4. 
What rock is shown?
Rock - Igneous - Rhyolite
  1. pumice
  2. rhyolite
  3. diabase
  4. pegmatite
 
5. 
What rock is shown below?
Rock - Igneous - Obsidian
  1. scoria
  2. diorite
  3. dunite
  4. obsidian
6. 
What rock is shown?
Rock - Igneous - Scoria
  1. scoria
  2. pumice
  3. gabbro
  4. diorite
 
7. 
What rock is shown?
Rock - Igneous - Pumice
  1. scoria
  2. basalt
  3. pumice
  4. granite

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