Which of the following is the BEST way to ensure soil health?
A. Maintaining clean, open ground between rows
B. Establishing ridges running up and down hills
C. Strip farming and leaving residues on fields after harvest
D. Clearing fields immediately after harvesting
E. All of these are good practices in ensuring soil health
Answer: C
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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
Which of the following are found near plate boundaries?
A. volcanoes B. mid-ocean ridges C. trenches D. earthquakes E. All of these choices are correct.
What evidence suggests that dinosaurs were social animals? What will be an ideal response?
Which of these properties of water is one which makes it such a good solvent?
A) its boiling point B) its high specific heat C) its high surface tension D) its hydrogen bonding ability