Changes in the orientation of Earth's axis over a 26,000-year cycle is known as
A) eccentricity. B) obliquity. C) precession. D) inclination.
C
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How might you distinguish a sodium-vapor street lamp from a mercury-vapor street lamp?
A) use binoculars to look for printing adjacent to the bulb B) look at the street lamps through a spectroscope and match their spectral patterns to their respective atomic spectra C) ask your local utility company to identify these lamps for you D) The shadows cast from a sodium-vapor street lamp tend to be more diffuse around the edges.
You would most likely expect a rain shadow on the:
A) east side of the Cascade Mountains in the Pacific Northwest. B) west side of the Sierra Nevada Mountains. C) west side of the Andes. D) west side of the Coast Range in California.
Which of these is commonly an effect of El Niño?
A) A decline in the exotic species of fish and other forms of marine life in the affected waters B) A decrease in ocean surface temperature in the eastern Pacific C) A decrease in rainfall in west coastal countries or states of the American continents D) An often catastrophic decrease in the commercial fisheries in Peru
Which of the following beds would be easiest for a stream to erode?
A) Lined with gravel and cobbles B) Bedrock C) Lined with sand and gravel D) Lined with silt