Which of the following statements is NOT true about clastic sedimentary rocks?
A. To be called a sandstone, quartz must make up more than 95 percent of the grains.
B. The natural cement that holds sedimentary rocks together is composed of dissolved minerals that precipitate.
C. The amount of pore space decreases as a sand is compacted into sandstone.
D. Clasts in a conglomerate or breccias can be different rock types or can be all the same rock type.
Answer: A
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When Ale pushes on a tree,
A. an interaction occurs between her and the tree. B. the tree pushes on Ale. C. Both pushes comprise a force pair. D. all of the above
Which of the following best matches the description?Mining in which the top layer of soil is removed to procure the underlying deposit.
A. resources B. reserves C. active solar system D. secondary recovery E. photovoltaic cell F. geothermal energy G. acid mine drainage H. black lung disease I. underground mining J. liquefied natural gas K. surface mining L. overburden M. renewable energy sources N. nonrenewable energy sources O. passive solar system
Which type of strength test measures the shear strength of a material along the failure plane?
a. triaxial test b. consolidation test c. unconfined compression test d. direct shear test
Which of the following is the only description that does not describe magnetic reversals?
A. They are recorded in the ocean crust. B. We are unsure why they occur. C. They occur instantaneously. D. They occur roughly every 500,000 to 700,000 years. E. They are recorded in continental lava flows.