When liquid gold becomes a solid, its particles get closer together. which best describes what happened to the gold?
a) the conservation of magnetism
b) the change in solubility in a physical change
c) the change in melting point in a physical change
d) the rearrangement of particles in a physical change

Option D

Explanation:

The phenomena where liquid gold on getting converted to solid undergoes a change where the particles get closer to each other shows that the particles of gold undergoes rearrangement which is a physical change.

In liquids, the inter-atomic spacing is more and the particles in liquid are loosely packed.

Moreover, liquids do not have a fixed shape and takes the shape of its holder due to the loose arrangement or packing of its particles.

Whereas the particles in solid are oriented or arranged in such a way that the inter-atomic distances between the particle is very less and the particles are tightly packed giving it a robust and fixed structure and shape. This re-arrangement is a physical change.

a sonic boom is a loud boom that breaks the sound barrier

explanation:

+15-35=-20

going in opposite directions