The Medieval Warm Period
A) began after the end of the Little Ice Age.
B) allowed Vikings to colonize Greenland.
C) was a significant global event.
D) saw glaciers advance in the Rockies of North America.
Answer: B
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Which of the following statements about electrons is true?
A. Electrons in atoms can be excited by light energy. B. Electrons behave like waves. C. Electrons have a negative charge. D. Electrons are particles. E. all of the above
With traditional intensive agriculture, farmers increase their crop yields by ____.
A. increasing their inputs of human and draft-animal labor B. using heavy equipment, along with large amounts of fossil fuels C. producing only enough for their family's needs D. increasing monocultures E. increasing greenhouse-raised crops
A positive-feedback mechanism tends to produce results that are opposite of the initial change and tend to offset it
Indicate whether the statement is true or false
What should you do if you are driving in your car and you encounter a tornado? Would a freeway overpass provide adequate shelter? Why or why not?
What will be the ideal response?