Which of the following is a basic structural component of the most common mineral group?
Ans: The silicon-oxygen tetrahedron
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You are given three radioactive samples (?, ?, and ? ) and can only dispose of one. The other two you must keep, one in your hand, the other in your pocket. How would you minimize your exposure risk?
A) keep ? in hand, keep ? in pocket, and dispose of ? B) dispose of ?, keep ? in hand, and keep ? in pocket C) dispose of ?, keep ? in pocket and keep ? in hand D) keep ? in pocket, dispose of ?, and keep ? in hand E) keep ? in hand, dispose of ?, and keep ? in pocket
The greatest threats to groundwater supplies are
A) groundwater pollution and depletion. B) global warming and the construction of dams. C) increased evaporation and increased precipitation. D) evapotranspiration and runoff.
What is an area where a river meets the sea and includes some of the earth's most productive wetlands?
A. euphotic zone B. estuary C. inlets D. bays E. coastal marshes
Why do relatively prosperous people tend to live in the cheaper land in the suburbs while the poor tend to concentrate in the inner city?
A) Prosperous people have access to better transportation. B) tax incentives C) historical inertia D) institutionalized racial segregation in housing E) It is a random result.