GEOLOGY

Detailed explanation-1: -The answer is letter C. Magnetic domain.

Detailed explanation-2: -A cluster of billions of atoms that all have magnetic fields lined up in the same way is known as a magnetic domain.

Detailed explanation-3: -A domain is a region inside of a material where groups of magnetic moments naturally align in the same direction. There can be numerous domains within an object. When there is no external magnetic field present, the domains are also oriented randomly so that there is no net magnetic field.

Detailed explanation-4: -Each atom has its own magnetic field, and if a group of atoms can align their magnetic fields, this group or cluster of atoms is called a magnetic domain.

Detailed explanation-5: -What is a magnetic domain? A magnetic domain is a region that’s composed of a group of atoms whose magnetic fields are aligned in a common direction. Why are iron atoms so strongly affected by magnetic fields? Because iron atoms have unpaired electron spins (+1/2 or-1/2).