Pahoehoe lava cools and stiffens as it flows, forming basalt with smooth, glassy-surfaced, wrinkled, or "ropy" ridges.
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Q22: A composite cone _.
A) forms by repeated
Q39: Pyroclastic bombs, cinders, and ash:
A) flow gently
Q40: Dated rocks and zircon crystals suggest that
Q41: A shield volcano commonly erupts when:
A) basaltic
Q42: Volcanic eruptions have no effect on global
Q43: Basaltic magma forms at the Mid-Oceanic Ridge.
Q45: The gentlest, least catastrophic type of volcanic
Q47: The Columbia River plateau is an example
Q48: A dike is a sheet-like, intrusive rock
Q49: Granitic magma has longer chains of silicate
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