Multiple Choice
Pegmatites,which often occur in dikes,are unusual among shallow intrusive rocks in that they
A) possess porphyritic texture.
B) possess exceptionally coarse grains.
C) are mineralogically identical to basalt.
D) are glassy,cooling so rapidly that crystals do not have time to form.
Correct Answer:
Verified
Correct Answer:
Verified
Q50: A majority of the melts in the
Q51: Large igneous provinces are formed by _,which
Q52: Which of the following statements cannot be
Q53: Granite,an intrusive igneous rock,is most similar in
Q54: If a body of magma becomes more
Q55: In the discontinuous series of Bowen's reaction
Q56: What is a tuff? How does a
Q57: Which of the following is not typically
Q58: As compared to coarse-grained igneous rocks,fine-grained igneous
Q59: Label the cross-section of the convergent boundary