A galaxy is
1.a huge rotating aggregation of stars, gas, and other debris held together by gravity.
2.a large diffuse cloud of gas.
3.what forms in the center of a cloudlike sphere of gases that flattens and condenses.
4.a thin cloud from which a sun and planets can form.
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When a pair of cross-wired speakers are brought face to face when playing monaural music, loudness is
A. amplified. B. diminished. C. both depending on how close. D. none of the above
Which of the following is a good example of a physical entity that is a hazard to public health?
A) In much of the United States, mosquitoes are known to transmit West Nile virus to people. B) The use of condoms is known to reduce the risk of most sexually transmitted diseases. C) An earthquake kills more than 200,000 people in Haiti and destroys countless homes, roads and buildings. D) Levels of mercury in some lakes result in dangerous levels of mercury found in fish sold to consumers.
How will compressional force change a rock body?
A) Stretch and thin the rock. B) Fracture the rock and grind the pieces alongside each other. C) Shorten and thicken the rock. D) The rock will not change.
Which of the following is incorrect regarding the littoral zone?
A) It spans both land and water. B) Landward, it extends to the highest waterline reached on shore during a storm. C) Seaward it extends to where water is too deep for storm waves to move sediments. D) In general usage, it only includes the near shore area of coastal environments. E) It shifts over time as sea level varies.