Volcanoes may be found at all of the following except
a. at the convergent boundary between oceanic and continental plates
b. at the convergent boundary between continental and continental plates
c. at the divergent boundary between oceanic plates
d. hot spots
e. none of the above

Currents in dc transmission lines can be 100 a or higher. some people are concerned that the electromagnetic fields from such lines near their homes could pose health dangers. for a line that has current 150 a and a height of 8.0 m above the ground, what magnetic field does the line produce at ground level? express your answer in teslas and as a percentage of the earth’s magnetic field, which is 0.50 g. is this value cause for worry?