Geology 1 Questions for Chapter 4 1) Lava flows are typically finer ...

31) ________ is thought to be common in the Earth's mantle but rare in the crust.
A) Pumice
B) Granite
C) Pegmatite
D) Peridotite
32) ________ often contain gem-quality crystals of minerals such as beryl and tourmaline and high concentrations of
relatively rare elements such as lithium, boron, and beryllium.
A) Welded tuff sheets
B) Basaltic lavas
C) Granitic pegmatites
D) Diorite plutons
33) The last minerals to crystallize on Bowen's Reaction Series result in igneous rocks with a ________ composition.
A) felsic
B) intermediate
C) mafic
D) ultramafic
34) Changing the composition of magma by incorporating surrounding host rock is known as ________.
A) magma mixing
B) partial melting
C) differentiation
D) assimilation
35) All of the following are factors that affect the generation of magma except for ________.
A) heat
B) pressure
C) crystal size
D) volatiles