The point at which the equator (0° latitude) and the Prime Meridian (0° longitude) intersect has no real significane but it is in the Atlantic Ocean, about 380 miles (611 kilometers) south of Ghana and 670 miles (1078 km) west of Gabon. http://geography.about.com/library/faq/blqzzerozero.htm
It depends on the place. Every point on Earth has a different set of latitude/longitude coordinates.
Indian Ocean
The prime meridian is a line at 0 degrees longitude.
longitude and latitude
Yes.
Yes.
If you give me accurate and precise numbers for the latitude and longitude of a point on the surface of the earth, I can use those numbers to go to the right place, and stick a pin in the ground within an inch of the exact spot.
Latitude and longitude are numbers that describe the location of a point on the Earth's surface. A nickel is not nailed down, so you can move it around to any place on Earth, drop it on the ground, and give it any latitude and longitude you want.
Absolute
You can pinpoint the exact location of a place on earth by using longitude and latitude coordinates. You may also use a GPS system.
By Longitude, Latitude, minutes, seconds. Or use Google Earth.
The location of any place on earth using Longitude and Latitude