A sinkhole that develops over a period of hours or days and forms from a collapse through the roof of an underground cavern is known as a
A) doline. B) solution sinkhole. C) karst valley. D) collapse sinkhole.
D
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At the time of Pangaea, South America and Africa were attached, forming a continuous landmass. Using Figure 19.2, describe what transpired in the past 225 million years to position the two continents where they are today.
What will be an ideal response?
Granitic magmas are associated with
A. convergent boundaries and decompression melting B. divergent boundaries and differentiation C. divergent boundaries and water release D. convergent boundaries and magmatic underplating
Which of the following is characteristic of a buffer?
A) The pH will go down significantly when OH- is added to the buffer. B) The pH will go down very slightly when OH- is added to the buffer. C) The pH will go up significantly when OH- is added to the buffer. D) The pH will go up very slightly when OH- is added to the buffer.
Life is possible on Earth's surface because of the:
a. gamma rays and ultraviolet wavelengths reaching the surface. b. filtering of shortwave radiation by our atmosphere. c. action of the atmosphere as an insulator and heat transfer/storage medium. d. all of these.