Briefly describe what ecologists mean by an ecosystem
What will be an ideal response?
An ecosystem is a network of dynamic relationships among components that interact with one another and influence one another by exchanging inputs of energy, materials, organisms and information. Some of the outputs are communities that may take the forms of forests, grasslands or marshes, while others we may view as ecosystem services such as pollination, water purification and renewal of soil fertility which have great value to human enterprises.
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As a stream changes from its headwaters to its mouth, which of the following is not likely to occur?
A) The channel gets smoother. B) The volume of water increases. C) The channel gets wider downstream. D) Sediment size gets smaller downstream. E) Flow velocity decreases.
Seafloor spreading can be detected by ________.
A. submersible observation of the seafloor B. changes in water chemistry C. acoustic monitoring D. changes in water temperature E. All of these are correct.
A star's color tells us
A) how much energy a star produces. B) its surface temperature. C) its rotational speed. D) both how much energy it produces and its surface temperature.
Poleward of the subtropical high, are midlatitude lows which experiences convergence of warm air blowing from subtropical latitudes and cold air blowing from polar regions
Indicate whether the statement is true or false.