In the 1900s, fuel efficiency in transportation greatly increased when engines were converted from
A) natural gas to coal and steam.
B) oil to coal and steam.
C) coal and steam to gasoline.
D) natural gas to gasoline.
C
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Which phytoplankton flourished in the Miocene, probably because of increased volcanism?
a. coccolithophores b. diatoms c. dinoflagellates d. foraminifera e. radiolarians
The increased presence of carbonic acid at deep depths causes calcium carbonate to precipitate into a
solid beneath approximately 4500 meters. Indicate whether the statement is true or false.
The most common stimuli that abruptly imbalance driving and resisting forces governing the occurrence of mass movements include what?
What will be an ideal response?
There are websites that predict solar weather, or essentially the impact of the solar wind on earth (in one sense, our planet is within the outer atmosphere of the sun). How is this possible when the speed of light is a fixed quantity?
A) The solar weather is related to sunspots, and they only affect Earth when the sunspots are in line with the earth, so knowing the solar rotation speed, you can predict when sunspots are aimed at Earth. B) The solar weather effect on Earth depends largely on the earth's magnetic field and its interaction with Earth weather, so scientists predict variations in both. C) The solar wind does not travel at the speed of light, so it arrives much later than when a solar event is observed. D) The solar forecast is like weather forecasting on Earth; solar scientists observe phenomena as they form and grow on the sun, and predict their timing