How did geologists determine that the west coast of california has a higher earthquake risk than other areas of the united states
a. by measuring the number of aftershocks
b. by looking at data from previous earthquakes
c. by measuring the height of tsunami waves
d. by analyzing the amount of liquefaction

Carbon is allowed to diffuse through a steel plate 15 mm thick. the concentrations of carbon at the two faces are 0.65 and 0.30 kg c/m^3 fe, which are maintained constant. if the preexponential and activation energy are 6.2 x 10-7 m2 /s and 80,000 j/mol, respectively, compute the temperature at which the diffusion flux is 1.43 x 10^-9 kg/m^2 -s.