The percentage of the Earth's surface covered by ocean is about
A. 60%.
B. 80%.
C. 50%.
D. 70%.
E. 85%.
Answer: D
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According to Richard Florida, ________ will be the "grandest of the grand challenges humanity will ever face."
A) feeding the world B) ensuring the periphery's massive urban regions are vibrant, sustainable and functional C) avoiding nuclear war D) conserving and identifying new energy resources E) living long enough to survive the waiting list for Green Bay Packer season tickets
Which of the following groups can be called autotrophs?
a. ants, termites and butterflies b. wolves, coyotes and foxes c. rabbits, moles and robins d. daisies, roses and grass e. mushrooms and fungi
Which of the features on this aerial photograph is a point bar?
A) A
B) B
C) C
D) D
A P-wave travels 48 km in 8 seconds. What is its velocity?
A) 6 km/s B) 40 km/s C) 56 km/s D) 384 km/s