What is the connection between the amount of silica in a melt and how viscous it is?
A) Silica forms strong bonds, so higher amounts of silica make for more viscous magma.
B) Higher silica content lowers the melting temperature and since increasing the temperature of a magma decreases viscosity increasing silica content increases viscosity.
C) Higher silica content means a larger amount of water a magma can dissolve and water decreases magma viscosity, so increasing silica conte
Answer: A) Silica forms strong bonds, so higher amounts of silica make for more viscous magma.
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The oldest known elements in the periodic table are the ones with
A. odd looking atomic symbols. B. the lowest atomic numbers. C. the highest atomic numbers. D. atomic symbols that match their modern names.
Chaparral is
A. found only in the tropics. B. characterized by a dry season that corresponds with cool temperatures. C. a type of drought-adapted shrub-land. D. characterized by moderate rain and snow.
A(n) ________ is a cone of debris that forms where an ephemeral stream emerges from the confines of the canyon. Its runoff spreads over the gentler slopes at the base of the mountains and quickly loses velocity, dumping most of its sediment load within a short distance.
A) drumlin
B) alluvial fan
C) esker
D) delta
The "sensitivity factor" in the model used to represent human environmental impact denotes ________
A) economic sensitivity to resource use B) human sensitivity to what needs to be done to protect the environment C) the sensitivity of endangered species to human population infringement D) the sensitivity of governments to carrying capacity demands E) the sensitivity of an environment to human pressures