Which option describes the process of exfoliation?
A) Fractures and cracks are formed when the rock forms by the cooling of lava.
B) Cracks open up parallel to the ground when surface rock expands slightly outward.
C) Bedding in sedimentary rocks causes planar breaks in the rock.
D) Stresses in the crust from plate tectonics cause fractures in many directions.
Answer: B
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True or False: Library research is essential during the early stages of a scientific study
Indicate whether this statement is true or false.
About 50% of laborers migrating from Tajikistan have gone to the city of:
A) New York B) Tehran C) Moscow D) Paris
Which of the following is the reason that strontium-90 is considered an especially dangerous radioactive isotope?
A) It has an exceptionally short half-life. B) It has an exceptionally intense radioactivity. C) It is chemically incorporated into bone and teeth and is therefore not readily eliminated from the body. D) all of the above
The objective of imposing a higher pollution tax is to
A. ensure firms have pollution charge credits for all reduced emissions. B. provide incentive for firms to maintain regulation emission levels. C. provide adequate incentive for firms to reduce their emissions by more. D. ensure firms must pay the pollution charge for all reduced emissions.