Igneous Rocks Question Preview (ID: 41618)


Igneous Rocks. TEACHERS: click here for quick copy question ID numbers.

Which type of rock is heated enough to melt and eventually cools?
a) Sedimentary
b) Igneous
c) Metamorphic
d)

What are intrusive igneous rocks?
a) Igneous rocks that come out as lava and cools ON the Earth's surface
b) Igneous rocks that stay as magma and cools underground
c)
d)

What are extrusive igneous rocks?
a) Igneous rocks that come out as lava and cools ON the Earth's surface
b) Igneous rocks that stay as magma and cools underground
c)
d)

Example of extrusive rock is...
a) Granite
b) Sandstone
c) Obsidian
d) Shale

Example of intrusive rock is...
a) Obsidian
b) Quartz
c) Sandstone
d) Granite

What determines an igneous rock's texture?
a) Speed of cracking
b) Speed of melting
c) Speed of cooling
d) Speed of erosion

What happens when magma/lava cools slowly?
a) Crystals have less time to grow, meaning less crystals
b) Crystals do not grow, meaning no crystals
c) Crystals have more time to grow, meaning more crystals
d) Crystals grow and fall off, meaning no crystals

What happens when magma/lava cools quickly?
a) Crystals have less time to grow, meaning less crystals
b) Crystals do not grow, meaning no crystals
c) Crystals have more time to grow, meaning more crystals
d) Crystals grow and fall off, meaning no crystals

Which texture is formed when lava/magma cools slowly?
a) Coarse-grained texture
b) Fine-grained texture
c)
d)

Which texture is formed when lava/magma cools quickly?
a) Coarse-grained texture
b) Fine-grained texture
c)
d)

Can intrusive igneous rocks only be found by digging?
a) Yes, they can only be found underground
b) No, they can also be found by erosion/weathering
c) No, they can only be found underground
d) Yes, they are made above ground

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