2005 U.S. legislation mandated increased use of biofuels, and the number of ethanol refineries is growing rapidly. In 2016, nearly ________ of the U.S. corn crop was used for ethanol production
A) 40% B) 90% C) 10% D) 20% E) 75%
Answer: A
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Animals that can live for extended periods on land, but must return to water-based environments to reproduce are
____. a. hominids b. plankton c. reptiles d. mammals e. amphibians
Evidence that Muslims were active traders with Southeast Asia centuries before the arrival of the Europeans.
A. Indonesia, including the Spice Islands, is overwhelmingly Islamic. B. Descendants of 14th century Middle Eastern traders still speak Bahasa Indonesia. C. Marco Polo mentioned them in his diary which was published in 1300s. D. The Muslim traders in the Moluccas traded freely with the later-arriving Spanish
____________ ____________ currents have diffuse boundaries and move cold water equatorward. Fill in the blank(s) with the appropriate word(s)
Pumice is ____
a. ?created in explosive eruptions involving viscous magma and high amounts of volatiles b. ?the solidified form of a lahar that has reached the sea c. ?compacted volcanic ash d. ?“clinkers” of basalt formed in slow lava flows e. ?created in slow eruptions involving fluid magma and low amounts of volatiles