An earthquake epicenter is the:
a. point where the seismograph is located.
b. point within Earth where movement along the fault occurs.
c. geographic center of a group of related earthquakes.
d. point on the surface directly above where a fault rupture occurs.
e. the strongest in a series earthquake aftershocks.
D
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The best way to reduce the pollution of agricultural fertilizer runoff from farm fields is to
A) treat the water before it reaches streams or rivers. B) reduce the amount fertilizer leaving the farm fields through such techniques as no-till cultivation. C) add chemicals into the rivers and streams that neutralize the fertilizers. D) raise crops in the rivers and streams that use the fertilizers.
The Canadian River flows through ________ and eventually into the ________
Fill in the blank(s) with correct word
Which of the following best describes hydrogen bonding?
A) Strong electrostatic attraction between oppositely charged ions B) Very strong bonding between cations and anions C) Very strong bonding from the sharing of electrons between atoms D) Electrostatic attraction between charged areas of adjacent molecules E) Weak interactions that become significant when molecules are very close together
Ultramafic igneous rocks (those with very high magnesium and iron, and low silica content) may offer the best hope for improving the environment by
A. being placed on the ocean floor, where they can absorb water and reduce global sea levels. B. absorbing CO2, with their rate of absorption capable of being increased by people. C. reducing the rate of salinization of soils when it is ground into a fine powder and sprinkled on the surface. D. pulling ground-level ozone out of the atmosphere as it cools.