Why have synthetic pesticides not consistently reduced U.S. crop losses to pests?
What will be an ideal response?
This is largely because of genetic resistance and loss of many natural predators. Also, scientists have concluded that crop losses increased between 1942 and 1997 despite the large increase in synthetic pesticide use. Additionally, the environmental, health, and social damages from pesticides in the United States are five to ten times the cost of pesticides. Finally, alternative pest management could cut the use of synthetic pesticides without reducing crop yields.
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Match the coastal term to the correct definition
A) Boundary that marks the seaward edge of the coast B) Area of ocean-related features from the water inland C) Between low-tide mark and where waves break at low tide D) Area from lowest tide level to highest elevation affected by storm waves 1) Shore 2) Coast 3) Nearshore 4) Coastline
Distinctive rock sequences of basalt and marine sedimentary rock that may be slices of the ocean floor are
A. fracture zones B. seamounts C. ophiolites D. guyots
The high runoff following sporadic desert downpours can create sudden local floods called ________.
A. storm surges B. ephemeral floods C. spring floods D. flash floods E. desert disasters
Each silicon-oxygen tetrahedron in single-chain silicate minerals shares:
a) No oxygen atom b) Two oxygen atoms c) Alternating two and three oxygen atoms d) Three oxygen atoms e) Four oxygen atoms