18. Identify and explain the phenomenon represented by the arrows on the diagram.

The phenomena represented here mark the direction of magnetic field that travels from North direction of the South.

Explanation:

The phenomena represented here mark the direction of magnetic field that travels from North direction of the South.

It also represents the alignment of magnetic dipoles with in a magnet in a direction in line with any external magnetic field in a way that it produces its own magnetic field that travels from North to the South direction.

imperial crisis leads to civil war.

roman forces withdraw from britain as goths attack rome.

odoacer topples romulus augustus

huns attack the empire and drive german peoples ahead of them.

answer; the president uses mass media to gain support for policies;