Download Intrusive and Extrusive Igneous Rocks

Intrusive and Extrusive Igneous Rocks
1) Igneous rocks only cool when magma reaches the surface of the Earth.
a) true
b) false
2) Igneous rocks cool very slowly on the surface of the Earth.
a) true
b) false
3) The size of crystals in an igneous rock is primarily determined by…
a) the composition of the rock.
b) how fast the rock forms.
c) the elements in the rock.
d) none of the above
4) A pluton in an igneous rock body that forms ____________.
5) Granite…
a) is the most common intrusive igneous rock.
b) has very large crystals.
c) is formed very slowly.
d) all of the above
e) a and b, but not c
6) Extrusive igneous rocks are also known as __________ rocks.
7) Extrusive igneous rocks __________ than intrusive igneous rocks.
8) Basalt…
a) is the most common extrusive igneous rock.
b) has very large crystals.
c) makes up the ocean crust.
d) all of the above
e) a and c, but not b
9) The size of __________ in igneous rocks determine their texture.
10) _________ igneous rocks are formed from lava.