What did scientist observe when they studied the magnetic fields of rocks on the sides of mid ocean ridges?

Important evidence that supports the theory of plate tectonics comes from studies of the magnetic properties and the ages of igneous rocks on the ocean floor. ... Geologists also studied the magnetic record of the rocks of the ocean floor, particularly the igneous rocks on the sides of mid-ocean ridges.

option a is correct i.e.

explanation:

in context to the membrane of nerve impulse, the outer membrane of neuron is semi permeable that is only sodium ions can pass through the membrane i.e. smaller ions can pass through the membrane while larger ions cannot pass through it.

c. live where it’s cold and icy