"How fast do seismic waves move through different rocks and under different conditions?"
What will be an ideal response?
Answer: "Waves move very slowly through the air or water that fills the pore spaces between the solid sediment grains. Seismic waves in igneous rocks are generally fast, and they move faster in mafic gabbro than felsic granite and even faster in ultramafic rocks; these differences between rock types indicate the importance of mineral types on seismic velocity. Seismic velocity also varies with changes in temperature and pressure. As an analogy, consider what would happen if you were holding onto one end of a rubber pole in one hand and one end of a steel pole in the other hand while someone struck the opposite ends of the poles with a hammer. You would feel much stronger vibrations through the steel pole than through the rubber pole. This happens because the body waves initiated by the hammer blows cause more squeezing and twisting within the rubber than within the steel, so the waves travel more efficiently, and thus faster, through the steel."
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Where does most of the sediment on the Pacific coast originate from?
a. Granite rock b. Biological productivity c. Basalt rock d. Mineral precipitation processes
e. Organic materialWhat are some alternative energy sources that might be used to replace fossil fuels?
What will be an ideal response?
Geothermal heat pump systems can heat and cool homes ____.
A. almost anywhere in the world B. in cold climates only C. in warm climates only D. near hydrothermal reservoirs only E. near plate boundaries only
The phrase "Jihad vs. McWorld" is intended to symbolize the struggle and tensions between
A) nutritious/traditional food and unhealthy/processed food. B) religious fundamentalists and secular capitalists. C) traditionally based cultural values and pop culture/shallow materialism. D) the local and the global. E) the North and the South.