How do earthquakes make images of Earth's interior?
What will be an ideal response?
Answer: "Earthquakes produce surface waves and two distinct body waves, called primary (P) and secondary (S) waves, which travel through the planet. P and S waves reflect and refract when encountering boundaries between materials. Seismograms are records of earthquake waves detected by seismometers located around the globe. The time required for different earthquake waves to reach these instruments reveals the velocity at which the waves move through Earth. Travel-time curves reveal that, in general, seismic-wave velocity increases at deeper levels in the mantle. Shadow zones where S waves, P waves, or both are not recorded reveal that Earth has a liquid outer core, beginning at 2900 kilometers below the surface, surrounding a solid inner core at 5155-6371 kilometers depth."
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A) Carnivora B) Cetacea C) Chiroptera D) Rhenanida E) Sirenia
What causes the destruction associated with hurricanes?
A) high winds B) heavy rainstorms C) severe flooding and coastal tidal surges D) high winds and heavy rainstorms E) high winds, heavy rainstorms, severe flooding and coastal tidal surges
Approximately what percent of geologic time is represented by the Precambrian? Which period within the Phanerozoic eon represents the longest interval of time? How long is it?
What will be an ideal response?
Most of the more-developed countries have ________.
A. low death rates and low birthrates B. high death rates and high birthrates C. low death rates and high birthrates D. high death rates and low birthrates