What are kettles, and how do they form? What will be an ideal response?
Kettles are circular to oval depressions, sometimes containing small lakes, found on outwash plains,
valley trains, or end moraines. They form when a block of ice, left by a retreating glacier, is partly or
wholly buried, and then melts, leaving a depression.
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Which of the following best matches the description?Comparative percentages of different age groups within a population.
A. dispersal B. immigration C. carrying capacity D. death phase E. density-independent factor F. population density G. emigration H. density-dependent limiting factor I. biotic potential J. r-strategist K. age distribution L. environmental resistance M. lag phase N. K-strategist O. exponential growth phase P. stable equilibrium phase
Of the following anions, which almost always forms soluble compounds?
A) NO3- B) OH- C) SO42- D) all of these
The word topsoilis commonly used, but not always correctly. The proper definition is ________.
a. the entire soil down to the base of the C horizon b. the A, E and B horizons c. the dark, organic rich layers of O and A d. only the O horizon
The Kyoto Protocol:
A. called for stabilization of greenhouse gases at levels that would not harm the climate system. B. did the actual research and reviews of thousands of published scientific papers and reports. C. set up arrangements for sharing data on climate, developing national plans for controlling greenhouse gas emissions, and for adapting to climate change. D. ended in a 60-hour negotiation session in which all the developed and developing countries, including China and the United States, agreed to legally binding restrictions on greenhouse gas emissions.