Why is the "four-corners country" of the United States dominated by the mesa-and-scarp landscape assemblage?
What will be an ideal response?
Answer: This is a coincidence of climate and geology. The geology is (mainly) flat-lying sedimentary rock that has been raised to more than 1,500 m above sea level. Streams and their tributaries have cut into the landscape. A series of caprock layers have made sure the slopes remain as cliffs.
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About one-third of the toxic metal, mercury (Hg), is released into the air from natural sources, such as rocks, soil, volcanoes, and the ocean. The remaining two-thirds come from human activities such as ____.
A. automobile exhaust B. airplane exhaust C. plastic recycling D. gold mining E. livestock farming
Which of the following is a prominent example of an industry that generally requires less-skilled, low-cost workers?
A) textiles B) steel C) auto D) education E) publishing
How do the strength and cohesion of clay-rich regolith or soil change with the addition of water?
A) Water reduces the strength of clays but raises the cohesion of the soil. B) Water increases the strength and cohesion. C) Water lowers the strength and cohesion. D) Water does not affect the cohesion but lowers the strength.
What is meant by interior drainage?
What will be an ideal response?