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How do you identify the north and south pole of a magnet?
Use a compass. It's needle points to the south pole of a magnet.
Why is the earth called a big magnet?
I would hesitate to hang the label "true" on that statement, but it isn't completely false either. The Earth does have a magnetic field.
Describe the effects and evidence of Earth's magnetic field?
The magnetic field can easily be noted if you hang a magnet from a piece of string, or use a compass; the compass needle is also magnetic. The idea is for the compass or hanging magnet to be able to freely rotate. Since the north pole of the compass needles points north, you can conclude that the south pole of planet Earth is towards the north. Remember that opposite poles attract each other.
Of True North and Magnetic North and Compass North which way is really up?
True North is the real North, following along the lines of longitude which converge at the North Pole, the farthest geographically North point on the planet, and the rotational axis of the planet. Magnetic North and Compass North are both the same thing, with the compass pointing along Magnetic North. Magnetic North however, is not the real North. If you were to follow your compass as far North as it could point, you would end up on the Prince of Wales Island in the Northwest Territories of Canada, over 1,500 miles away from the North Pole. Magnetic North can be adjusted to True North on your compass by knowing the local magnetic variation of your area and adding/subtracting accordingly. A third North is Grid North, which follows the Grid Lines on a standard map. At the South Pole, every direction is True North, so Grid North is used instead and can be found by following the Prime Meridian northwards. Hope that helps.
How does the Earths magnetism help us find your way?
As such till now there is no proper or valid theory to prove or explain the cause of earth's magnetic field. A bar magnet or a magnetic compass alligns itself in the direction of earth's magnetic field. This process happens as south pole of magnet alligns itself to north pole of earth n vice versa true north pole is southpole of magnet. Exact location of places can be done by calculating the magnetic flux density n various other factor . . . . . .
