Multiple Choice
Natural glass such as obsidian forms when ____.
A) magma cools too rapidly for crystals to form
B) pegmatite melts, moves to Earth's surface and ,re-forms
C) magma cools too slowly for crystals to form
D) magma has a very low silica content
E) gas escapes through lava
Correct Answer:
Verified
Correct Answer:
Verified
Q19: Basalt and gabbro are compositional equivalents, which
Q20: The process of assimilation _.<br>A)includes melting and
Q21: Andesite and _ are respectively, extrusive and
Q22: The only minerals in the continuous branch
Q23: The process of assimilation excludes any incorporation
Q25: Basalt and gabbro are the rocks that
Q26: Basalt and gabbro are compositional equivalents, which
Q27: The increase in Earth's temperature with depth
Q28: Aphanitic, phaneritic, and porphyritic are terms that
Q29: Discuss how Bowen's reaction series helps explain