In which of the following locations do squall lines generally form?
A. ahead of an advancing cold front
B. along a warm front
C. in the cold sector where warm, dry air meets warm, humid air
D. at the centre of low pressure
Answer: A
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The pressure gradient force is directed from higher to lower pressure:
A) everywhere except the equator. B) only at the equator. C) everywhere. D) only at the poles. E) only in the Northern Hemisphere.
Low-pressure systems tend to form where ____
a. a warm air mass is expanding b. a cold air mass is being forced to collide with a warm air mass c. a warm air mass is being forced to collide with a cold air mass d. warm air and cold air are moving parallel in the same direction e. warm air and cold air are moving in parallel but opposite directions
A region has just had a 100-year flood. That means that
A. another equally large flood will occur in one hundred years. B. another flood of that size cannot happen in the same year. C. a flood event of that size has a 1 percent probability of occurrence in the next year. D. All of the choices are correct.
The radioactive element Unobtanium-189 (Ut-189) decays to the stable element Dilithium-171 (Di-171). The half-life of Ut-189 is 10 million years. Using a very sensitive atom-counter instrument, you determine that a mineral sample has 150 atoms of Di-171, and 50 atoms of Ut-189. Assume that no atoms have been lost due to metamorphism over the lifetime of the rock.Use this information to answer the following question.What is the age of the mineral?
A. 10 million years old B. 20 million years old C. 30 million years old D. 40 million years old