After one half-life, ____________________% of the radioactive parent atoms will have decayed to
stable daughter atoms. Fill in the blank(s) with the appropriate word(s).
50
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Which of the following is a common metamorphic process?
A) Deforming objects into new shapes B) Rotation of minerals into a common orientation C) Remobilization of chemical constituents into light and dark bands D) Dissolving some parts of the rock and carrying the material away E) All of these are correct.
What changes have increased the risk associated with the Santa Ana winds in southern California?
A) There hasn't been an increased risk — people have started building outside of fire zones now. B) Commonly used landscape trees are more flammable than naturally occurring vegetation. C) Climate change has increased the local rainfall, leading to mudslides. D) Very little flammable material exists anymore in the landscape, so houses burn more easily.
Which of the following coastal features is not a characteristic of a submergent coastline?
A) Barrier islands B) Estuaries C) Wave-cut platform D) Irregular coastlines
What happens on either side of the equilibrium line in a glacier?
A. Melting occurs only above the line and sublimation occurs only below the line. B. Air temperatures are below freezing below the line and above freezing above the line. C. Sublimation occurs only above the line and melting occurs only below the line. D. Above the equilibrium line, the amount of accumulation exceeds the amount lost by various processes.