Mass extinctions at the end of the Ordovician occurred because of ____
a. dramatic changes related to glaciation
b. dramatic chemical changes in seawater related to meteorite impact
c. increased solar radiation
d. decreased solar radiation
e. increased volcanism
a
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Which of the following is a chemical property of silicon?
A. its density B. its ability to react with oxygen C. its melting point D. its ability to conduct electricity E. both C and D
Suppose you're coasting in a car at 60 km/h and apply the brakes until you slow to 40 km/h. When you suddenly release the brake, the car tends to
A) momentarily regain its higher initial speed. B) continue moving at 40 km/h in the absence of forces. C) decrease in speed whether or not other forces act.
Almost all of the earth's weather occurs in the:a
exosphere. b. stratosphere. c. mesosphere. d. thermosphere. e. troposphere.
This instrument uses wet-bulb and dry-bulb temperature to obtain relative humidity:
a. infrared hygrometer b. sling psychrometer c. hair hygrometer d. electrical hygrometer e. mechanical hygrometer