Scientist have been able to determine the composition of earth's layers by: a) studying photographs taken from satellites. b) drilling down and bringing up samples to study. c) shooting x-rays into the planet. d) making inferences based on data from seismic waves.

D is the correct answer

Julia would be observing a. static electricity was caused by her sweater rubbing against her shirt and transferring electrons. she didn't touch anything metal, so that would cancel out b.she most likely didn't rub her sweater against her hair either, so that cancels out c.she also didn't scoot across the carpet while trying to take her sweater off, that cancels out d.so that leaves a.a. is correct.

Full change in the electric plus system