How is an electromagnet different from a bar magnet?

A) Bar magnets have a north and south pole, but electromagnets do not.

B) Electromagnets are strong, permanent magnets, but bar magnets are always weaker.

C) Electromagnets are only magnetized when a current flows through a wire wrapped around the core.

Eliminate

D) Bar magnets are attracted to ferromagnetic substances such as iron. Electromagnets are attracted to all metals.

C) Electromagnets are only magnetized when a current flows through a wire wrapped around the core.

Explanation:

An electromagnet is a magnet that runs on electricity. Unlike a permanent magnet (bar magnet), amount of electric current that flows through electromagnet changes the strength of an electromagnet. The poles of an electromagnet are determined by flow of electricity.

i believe it is 40–40–20%

explanation:

a rain shadow is a dry region of land on the side that is protected against the prevailing winds of a mountain range. the prevailing winds are the winds that occur most of the time in a particular place of the earth

prevailing winds carry air toward the mountain range. as the air rises up over a mountain range, the air cools, water vapor condenses, and clouds form. on this side of the mountains, called the windward side, precipitation falls in the form of  rain  or snow. this dry air produces a  rain shadow.