Which of the following gases is produced when an acid reacts with an active metal?
A) CO2(g)
B) H(g)
C) H2(g)
D) H2O(g)
C
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Why are there two different fronts in a midlatitude cyclone?
The half-life of the carbon 14 isotope is 5730 years. If there were 4 billion atoms of C-14 in a particular organism at the time it died, how many atoms of C-14 would there be in the remains of that organism 11,460 years after it died?
A. 4 billion B. 2 billion C. 1 billion D. 8 billion E. 3 billion
Historical records of volcanic eruptions ____
a. ?are used effectively by land use planners and developers b. ?cannot be used for prediction since volcanoes are inherently unpredictable c. ?are effective in identifying areas at risk for volcanic dangers d. ?are difficult to obtain since they depend on written history e. ?are easily used to accurately predict the time of an eruption
Satellites measure rainfall from space using which instrument?
a. radar b. tipping-bucket rain gauge c. ceiliometer d. weighing-type rain gauge e. standard rain gauge