Slash and burn agriculture is a widely used method of growing food in which wild or forested land is clear cut and any remaining vegetation burned. The resulting layer of ash provides the newly-cleared land with a nutrient-rich layer to help fertilize crops.
It is measured with 180 degrees imaginary lines that form circles around the Earth east west, parallel to the Equator. These lines are known as parallels.
The only factor that distinguishes different cylindrical map projections from one another is the scale used when spacing the parallel lines on the map. The downsides of cylindrical map projections are that they are severely distorted at the poles.
