The principle hazard of microbursts to aircraft in the process of taking off or landing is
A) windblown sand and dust damaging jet engines.
B) sudden changes in lift and tailwinds.
C) Doppler radar.
D) lightning.
Answer: B
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Which event is thought to have been a cause for past mass extinctions?
a. A massive earthquake b. A massive tsunami c. An epidemic d. The collision with an asteroid or comet e. The most prolonged ice age
Between 1800 and 2015, the percentage of the U.S. population living in urban areas increased from 5% to 81%.
Answer the following statement true (T) or false (F)
In a typical climograph, a continuous line connects average monthly values to produce an annual ____________________ curve
Fill in the blank(s) with correct word
The fact that a threshold is expected to exist with all poisons is related to the idea that:
A. some things you are exposed to are not absorbed B. some things are safe and non-toxic C. eventually as dose increases effect will diminish until very little added effect occurs with increasing dose D. there is some small dose for every compound that is expected to be safe