During the Pleistocene glaciation, temperatures fluctuated as much as 10o C cooler than today. Indicate whether the statement is true or false
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If a fusion reaction produces no appreciable radioactive isotopes, why does a hydrogen bomb produce significant radioactive fallout?
A. The radioactive fallout is a result of the fission reaction used to ignite the thermonuclear fusion reaction. B. It is a misconception that fusion reactions produce no appreciable radioactive isotopes. Therefore, radioactive fallout is unavoidable. C. Once a hydrogen bomb is exploded, all matter within nearly 100 miles becomes radioactive fallout. D. The fallout is only the radioactive remnants of the bomb's structure and casing.
If we used a vertical scale identical to the horizontal scale, how many squares on the graph would accommodate the maximum relief along the profile?
A second example of a vertical profile is in Figure 23.6. Using the same procedure as you did on the previous assignment, construct a topographic profile. Label the South Fork of the Gualala River (see Figure 23.4, Step 3), the bench mark at 112 feet, and various road crossings on your profile. The coastline forms a contour line of equal elevation—sea level. Note the change in contour interval and scale from that of Figure 23.5. Use Figure 23.6 to answer further questions about preparing a topographic profile.
Suggest why sodium chloride, NaCl, is insoluble in gasoline. Consider the electrical attractions.
A. Since this molecule is so small, there is not much opportunity for the gasoline to interact with it through any electrical attractions. B. Since gasoline is a very polar molecule, the salt can only form dipole-induced dipole bonds, which are very weak, giving it a low solubility in gasoline. C. Salt is composed of ions that are too attracted to themselves. Gasoline is nonpolar, so salt and gasoline will not interact very well. D. Since gasoline is so strongly attracted to itself, the salt, NaCl is excluded.
Steep-sided hills of viscous lava that pile up over volcanic vents are known as
A. volcanic domes. B. composite volcanoes. C. cinder cones.