Milankovitch cycles ________
A) are the cause of ice ages
B) seem to be unrelated to ice ages
C) correlate fairly well with some major ice advances
D) are possible ice age causes related to changing positions of continents
E) are based on the varying output of the sun
Answer: C
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In what energy system does gasoline (not made from heavy oil) have the highest net energy yield?
A. transportation B. space heating C. high-temperature industrial D. electricity production
Why is biomass energy renewable?
A) Once forest wood is burned, the forest is not replanted. B) Once plants are harvested, the soil in no longer fertile for replanting and regrowth. C) Once plants are harvested, they can grow again if proper conditions are provided and rate of harvest does not exceed rate of planting. D) There are always more plants growing somewhere on Earth. E) Any living organism is considered renewable.
Among all educational groups, unemployment is highest for those with just a high school diploma
Indicate whether the statement is true or false
A star that shows a red shift on one side and a blue shift on the other is
A. revolving around another star. B. receding. C. spinning. D. approaching.