Explain the pros and cons of using the synthetic organic pesticide DDT against malarial mosquitoes
What will be an ideal response?
"DDT appeared to be nothing less than the long-sought ‘magic bullet,' a chemical that was extremely toxic to insects yet seemed nontoxic to humans and other mammals. It was inexpensive to produce. It was broad spectrum, meaning that it was effective against a multitude of insect pests. It was also persistent, meaning that it did not break down readily in the environment and hence provided lasting protection."
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The white arrow in this cross-section points to an unconformity (black line). What kind of unconformity is it?
A) disconformity B) angular unconformity C) nonconformity D) dike
No tornadoes have been recorded in the United States during the months of November, December, and January
Indicate whether the statement is true or false
Which of the following does NOT demonstrate the use of renewable resources?
A. using wind to power windmills to produce electricity B. using corn or switchgrass to produce fuel ethanol to power our vehicles C. using underground coal deposits to produce heat and electricity D. using water from a lake to turn turbines in a hydroelectric dam to produce electricity
The atmospheric circulation cells that operate in the mid-latitudes are called ____ cells
A) Hadley B) Ferrel C) polar D) trade wind