The magnetic field of Earth acts very similarly to a bar magnet. The magnetic field is created by molten iron within Earth's core. Humans and animals rely on the magnetic field for navigation. Describe how the magnetic field is used for navigation, and explain how it protects life on Earth.

.

By using a compass needle which aligns itself with the magnetic poles of the earth, navigators were able to determine which direction was North and which was South.

The Earth's magnetic field serves to deflect most of the solar wind, whose charged particles would otherwise strip away the ozone layer that protects the Earth from harmful ultraviolet radiation.

Explanation:

the value of the 4 in the hundreds place is 400 while the value of th e 4 in the tens place is 40

400 is way bigger than 40.