Earth is like a bar magnet. what does this mean about its magnetic poles?

question 5 options:

a. there is only a magnetic north pole.

b. there are both magnetic north and south poles.

c. there is only a magnetic south pole.

d. there are two magnetic north poles.

Energy is the ability to do work which measures what

Explain how the energy of rubber ball is tranforned as it roll down a ramp. give evidence that the energy of the og the ball remains the same at all points on the ramp

Use the profile illustrated for problem (1). assume that the layer of silty sand fill (sm) is placed over the entire site. estimate the thickness of the fill (h - in feet) that will cause the effective vertical stress at the center of the clay layer to increase by 517.5 pounds per square foot.