Answer : Option D) the electrons in some metals pair up to create a magnetic field.
Explanation : Most of the metals are magnetic in nature including some exceptions. When the unpaired electrons get aligned with the magnetic field they posses magnetism. Also there are some paired electrons in metals which align themselves according to the magnetic field and create magnetism in them.
Answer:
Hydrosphere
Explanation:
Hydrosphere includes all water on the surface of the planet.
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Yes because color change is a sign of a chemical reaction.
Answer:
by moving between defined energy levels