Long Valley Caldera cumulative earthquakes between 1983 and 2015, USGS. The vertical bars on the graphs above
correspond with the left-side y-axis and represent the number of earthquakes per week. The thicker gray line indicates the
cumulative number of earthquakes and corresponds with the right-side y-axis.
43 .As used in line 10, “depression” most nearly means
A) dejection.
B) decrease.
C) crater.
D) trouble.44 .The authors use the phrase “as recently as 600 years ago” (line 22) primarily to
A) suggest that there will be another eruption this century.
B) convey a sense of the magnitude of geologic time.
C) communicate irony, because 600 years ago is not recent.
D) indicate that the word ‘recently’ is a relative term.45 .As used in line 38, “temblor” most nearly means
A) drum.
B) earthquake.
C) eruption.
D) caldera.46 .What is the reason geologists have increased their monitoring of the Long Valley Caldera?
A) It has been more than 150 years since the last eruption.
B) Eruptions happen frequently in volcanic chains of such size.
C) The area is experiencing geologic activity indicative of an impending eruption.
D) The swelling of the caldera may damage the sensitive geodetic equipment.47 .Which choice provide the best evidence for the answer to the previous question?
A) Lines 19-24 (“The volcanic...mid-1800s”)