How do geologists determine the composition of Earth's interior? Why not examine it directly?
What will be an ideal response?
Energy from earthquakes allows scientists to model its composition. The distance and temperatures are too great to penetrate deep into much of Earth's lithosphere, let alone the rest of the planet.
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The H-R Diagram, an important tool of astronomers, relates stellar temperature to stellar
A. color. B. mass. C. distance. D. brightness. E. density.
What evidence has shown conclusively that the oceanic crust is geologically young and that the parallel magnetic striping pattern of basalts is symmetrical with regard to oceanic ridges?
A)radiometric dating of oceanic basalts and sequences from continents exclusively B)the unusually thin layer of oceanic sediments and ages of contained fossils exclusively C)the existence of the same magnetic anomaly patterns in all ocean basins D)radiometric dating of oceanic basalts and sequences from continents AND the unusually thin layer of oceanic sediments and ages of contained fossils E)magnetic reversals contained in continental crusts that were at one time oceanic basalts
Air pollution is
A) a form of photochemical smog. B) gaseous sulfur and phosphorus. C) a concentration of a trace substance at a level greater than occurs in average air. D) a concentration of a trace substance at a level greater than one percent. E) concentrated in tropical regions.
The first comprehensive national law to manage water quality was the ________
A) Clear Drinking Water Act B) Oil Pollution Control Act C) Clean Water Act D) Water Pollution Control Act E) Safe Drinking Water Act