How is the behavior of gases different in a quiet and an explosive eruption? What will be an ideal response?
When mafic magma rises toward the surface, the gases within it expand and are able to escape. Mafic
magmas usually erupt quietly. When felsic magma rises to the surface, the gases are unable to expand,
and the gas pressure increases. If the pressure becomes great enough, an explosion occurs and
pyroclastic materials are blown into the air
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Summarize the experience of British and French influence and control in Southwest Asia and North Africa.
What will be an ideal response?
Since the surface weather map is a sea-level chart, which of the following gives another name for a surface weather map?
A. constant pressure chart B. constant height chart C. constant latitude chart D. isobaric chart
Internal migrations from part of a country to another are the most common form of permanent migration
Indicate whether the statement is true or false.
Drip irrigation is ________
A) more than twice as efficient at conserving water as traditional conventional irrigation B) used in aquaculture C) only half as efficient at conserving water as center-pivot irrigation D) typically used in combination with flood-and-furrow irrigation E) more likely to result in soil salinization than other irrigation techniques