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The stiff basaltic rocks of the sea floor are bent as they enter subduction zones. This means that: Bending of sea-floor rocks near the subduction zone of Oregon and Washington produced a deep trench, which has been filled with discarded Microsoft Windows CDs, thrown away by people sick of all the viruses. Correct! Subduction zones produce sea-floor trenches, which may be filled with water or with sediment washed from nearby land. Subduction zones produce Death-Valley-type down-faulted spreading valleys, which form the deepest parts of the ocean. Bending of sea-floor rocks at subduction zones produces high ridges, such as the coast ranges of California. Erosion of continents by rivers near subduction zones produces deep troughs that include the deepest water in the ocean.

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Students investigated the effect of light on the carbon cycle in aquatic ecosystems by performing the controlled experiment summarized below. The students placed equal amounts of water (pH 7.0) from a large aquarium in glass beakers. The students transferred aquatic plants from the aquarium to several of the beakers, and then they placed equal numbers of the beakers in the light or the dark (Figure 1: groups I and II). Similarly, the students transferred goldfish from the same aquarium to other beakers, and then they placed equal numbers of those beakers in the light or dark (Figure 1: groups III and IV). Finally, the students placed an equal number of beakers containing water only in the light or dark (Figure 1: groups V and VI).After exposing the samples to light or dark for one hour, the students recorded the pH of the water in each beaker. Carbon dioxide dissolved in water will lower the pH of an aqueous solution. In the experiment, the students used changes in pH to monitor changes in the amount of carbon dioxide in the water. For each treatment group, the students calculated the mean pH and standard error, as documented in the table below.The results for treatment groups V and VI could suggest which of the following questions about the design of the experiment?ADo the glass beakers prevent light from reaching the test samples?BIs the method used for measuring pH harmful to aquatic organisms?CIs the availability of carbon dioxide a limiting factor in aquatic ecosystems?DDoes the aquarium water contain living microorganisms?

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