An ecosystem is best described as
A) a system that is composed of nonliving or inorganic matter.
B) a system composed of living organisms.
C) a group of living organisms and the abiotic spheres with which they interact.
D) all living organisms in the atmosphere, hydrosphere, and lithosphere.
E) a group of living plants and the soil types that is present.
Answer: C
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Which factor best explains the difference in sea ice (shown in white) between March in the northern hemisphere and March in the southern hemisphere?
A. seasonal variation in daylength B. low sun angle throughout the year C. high albedo for all surfaces D. continentality for all surfaces
Why might the following nuclear reaction not be very good for energy production in a fission reactor? Fe ? Si + Mg + 3 neutrons
A) The material only produces a few neutrons so the chain reaction will not be very efficient. B) The reactants are too small to obtain energy from the missing mass due to strong nuclear force. C) The products are not the right size to obtain much energy from the missing mass due to the strong nuclear force. D) The mass of the byproducts is too high and therefore the energy released will not be high enough. E) Interatomic attraction between the products will impede the separation of the atoms from the unstable nuclei.
Which of the following is not a physical property used to distinguish soils?
A) color B) texture C) porosity D) moisture E) temperature
In plate tectonics terminology, the volcanic islands comprising the country of Japan are an example of a(n) ____________________
Fill in the blank(s) with correct word