In glacial deposits, a long sinuous ridge of gravel and other sediment deposited by meltwater from a retreating glacier or ice sheet is called:
a. Kame
b. Esker
c. Kettle hole
d. Hummocky ridge
Answer: b. Esker
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The mass extinction at the end of the Ordovician set the stage for:a
more species to go extinct. b. groups of organisms to diversify. c. groups of organisms to withdraw from previous habitats. d. groups of organisms to repopulate abandoned niches. e. groups of organisms to diversify AND to repopulate abandoned niches.
Which of the following is not true regarding slope failures involving snow?
A. They may be very slow or very fast. B. The density of snow is always the same and so can be ignored when studying avalanches. C. They may be understood using the same mass-movement principles that apply to earth and rock movements. D. They may creep, flow, slide, and fall. E. They may travel from only a few meters (or less) to several kilometers.
If an earthquake occurred near the oceanic trench in this figure, which one of the following hazards is likely to threaten the town of Mesaview?
A. landslides and other slope failures caused by shaking B. liquefaction of soils and other weak materials because of shaking C. destruction by a tsunami D. ground shaking
The major factor in glacial periods lasting tens of millions of years appear to be changes in the Sun's heat output, rather than changes in shapes, sizes, and orientations of the continents and oceans.
Answer the following statement true (T) or false (F)