Some planktonic organisms, known as ________, carry on photosynthesis and are the base of the food web in a pelagic ecosystem.
Fill in the blank(s) with the appropriate word(s).
phytoplankton
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Isotopes of an element all have the same number of neutrons, but differing numbers of protons. Indicate whether the statement is true or false
Earlier than 200 million years ago, the continents were joined into one supercontinent called ____
A) Pangaea B) Panthalassa C) Oceanus D) Tethys
Wood pellets are produced from the waste sawdust of lumber and paper mills. Home-heating stoves burning these pellets can heat homes directly, instead of relying on other energy sources. Heating your home with wood pellets is
A) sustainable, less polluting, and more efficient than heating a home using electricity from a coal-fired power plant. B) sustainable, much more polluting, and about 30% more efficient than using electricity from a coal-fired power plant. C) not sustainable but is less polluting and is about as efficient as using electricity from a coal-fired power plant. D) not sustainable and pollutes more than using electricity from a coal-fired power plant.
Southwestern North America contains a large area called the Basin and Range province. What is the origin of this name?
A) Thrust faulting along the San Andreas fault produces linear ridges, the ranges, with intervening basinal valleys forming fault block mountains. B) Folds have formed by compressional stresses along the plate margin forming ridges (ranges) and valleys (the basins) of the basin and range province. C) The area is characterized by chains of volcanos forming ranges next to basins that form valleys. D) Ranges are uplifted horst blocks adjacent to basins formed as graben.