In a scientific experiment, a control is
A) a test that duplicates an experimental test except for one variable.
B) a way to study the effects of just one experimental variable.
C) both A and B
D) neither A nor B
C
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Maps of the Difficulty: Global distribution of the mean height of the 500 mb surface show a decrease in height at the pole, which is due primarily to:
A) low temperatures at the pole. B) low-pressure systems at the pole. C) the absence of the Coriolis effect at the pole. D) the strong magnetic field at the pole.
Upon landfall, a tsunami will move ____
a. ?at walking speed b. ?faster than it traveled in the open ocean c. ?at the speed of a helicopter or small airplane d. ?much too fast for a person to outrun e. ?at the speed of a commercial jet
Which of the following topics of study would best incorporate the holistic perspective?
A. the degree to which soil particles expand when they are wet and contract when they dry out B. the examination of soil grains under a microscope to identify the amount of air space between grains C. the impact of political policies on soil erosion D. identifying the soil type from a sample collected in the field
Limestone is dissolved primarily as ________ reacts with water to form a weak acid.
A. methane B. fluorine C. silica D. nitrates E. carbon dioxide