Land erosion causes water pollution
Indicate whether the statement is true or false
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When Joan pushes a crate across a level floor at constant velocity, friction between the crate and the floor is
A. the same amount as her pushing force. B. less than her pushing force. C. more than her pushing force. D. none of the above
A star that is twice as hot as another has twice the
A. Celsius temperature. B. Kelvin temperature. C. Fahrenheit temperature. D. all of the above
What do studies of paleomagnetism show?
a. the northern and southern hemispheres have reversed position many times b. the ocean basins are young c. each continent once had its own magnetic pole d. the continents remain fixed and the north magnetic pole has moved e. all of these
Experiments in which conditions are deliberately altered and all other variables are held constant are known as ________ experiments.
A. Natural B. Hypothetical C. Double-blind D. Probability E. Manipulative