A(n) ____________________ is a sharp, often pyramidal peak created by headward erosion of multiple alpine glaciers
Fill in the blank(s) with correct word
horn
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Prior to the discovery of radioactivity in the late ____________________ century, geologists were
able to develop a(n) ____________________ geologic time scale. Fill in the blank(s) with the appropriate word(s).
Students new to mineral identification often confuse shiny, dark-colored nonmetallic minerals for those minerals with a metallic luster. Explain how streak can be useful for telling these minerals apart
What will be an ideal response?
Which of the following are NOT common in landscapes formed by carbonate rocks?
A. sinkholes B. outcrops with pits or holes C. fractures widened by dissolution D. well-defined layers (beds) E. All of these are common in carbonate landscapes.
Only 5% of the Earth's land is strictly protected from human activities. With this level of protection, which of the following statements is the reason that so many land species are increasingly threatened with extinction?
A. Because conservation biologists say we need to strictly protect 20%. B. Because so much land is being lost to flooding from rising sea levels. C. Because of reduced sunlight from atmospheric pollution. D. Because of a dramatic increase in earthquakes and volcanoes.