Explain the types of products the National Weather Service issues in regards to tornadoes
What will be the ideal response?
ANSWER: The National Weather Service issues several types of products related to tornadoes. A tornado watch is issued by the Storm Prediction Center to alert the public that tornadoes may develop within a specific area during a certain time period, usually a few hours long. Many communities have trained volunteer spotters, who look for tornadoes after the watch is issued. Once a tornado is spotted—either visually or on a radar screen—a tornado warning is issued by the local NWS office, typically covering parts of one or several counties and lasting from 30 to 45 minutes. A tornado emergency may also be issued on rare occasions when an especially strong tornado threatens a populated area. In some communities, sirens are sounded to alert people of the approaching storm. Radio and television stations (including NOAA Weather Radio) interrupt regular programming to broadcast the warning, and most newer cellphones will display the warning automatically through the Wireless Emergency Alert system (assuming the phone’s owner has not blocked this feature).
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How does a catalyst increase the rate of a reaction?
A. It raises the activation energy of the reactants, which makes the reaction proceed faster. B. It is neither created nor consumed in a reaction. C. It increases the energy difference between the reactants and products. D. It has nothing to do with the rate of reaction. E. It lowers the activation energy.
The average thickness of oceanic crust is:
A. 50 km B. 5 km C. 7 km D. 12 km
Which of the following is true of the types attractive forces present in the three states of matter?
A) They are different in each of the three states. B) They are the same in each of the three states. C) They are the same in gases and liquids, but different in solids. D) They are the same in liquids and solids, but different in gases.
When the world's population reached 6 billion in 1995, it was forecast that at a steady rate of growth the population would reach 12 billion in approximately 45 years. That period of 45 years is known as
A) doubling time. B) doubling life expectancy. C) double increase rate. D) double overpopulation. E) double demographic transition.