Question

When lava hardens into rock what happens to the magnetic crystals in therock

Answer 1

When lava hardens into rock minerals are formed. These minerals are the magnetic crystals then align themselves to the magnetic field of the earth.

Step-by-step explanation:

They get locked in the magnetic field as very small tiny compasses that is crystals behave as magnets.

These crystals loses its magnetism only if it is heated above the curie point which is the temperature at which the magnet loses its magnetism.

Answer 2

Before magma or lava solidifies minerals with magnetic properties align with Earths magnetic field and as molten rock soldifies they remain aligned to the magnetic field like tiny natural compasses.