What is a disadvantage of modern synthetic pesticides?
A. They decrease food supplies.
B. They have aided the spread of insect-transmitted diseases such as malaria.
C. They may become less and less effective over time.
D. They work slowly.
E. They worsen soil erosion.
Answer: C
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The thermohaline currents of the oceans
A) are major contributors to global climate change. B) carry nutrients upward and transport heat that warms Europe and North America. C) are growing stronger and warmer. D) are warmest in the deepest parts of the ocean.
Explain why the two elevations, around 0.5 kilometers above and 4.5 kilometers below sea level, are the most common elevations on Earth
What will be an ideal response?
Scientists are observing a rapid decrease in polar ice owing to global warming. How might a warming climate affect national claims to land and resources in Antarctic and Arctic areas? How might the states of the world best address those changing claims?
What will be an ideal response?
A ________ forms when a rising mantle plume causes the overlying crust to dome and separate into three rifts
A) triple junction B) complex rift C) submarine canyon system D) divergent boundary