Which of the following statements is true about magnetic fields. magnets and magnetic fields were only just discovered in the last 500 years. the earth’s magnetic field is confined within the core of the earth. the earth’s magnetic field protects the surface from strong electrical currents coming from the sun. magnetic fields are unreliable for use in navigation.

Pushing magma up through the interior of earth

Explanation:

answer would be letter choice (a),   a ball resting on a shelf. would be another example of potential energy   >   stored energy > not moving.

a ball spinning on a finger   >   kinetic energy > moving energy

a ball rolling on the ground   >   kinetic energy   > moving energy

a   ball flying through the air   > kinetic energy   >   moving energy

hope that                                         : )

f=ma newton's second law 7x8=56n