Around 1800 (plus or minus about 5 years) is when it was estimated that the world's population had reached 1 billion.
The Earth is divided into degrees of longitude and latitude which helps us measure location and time using a single standard. ... Longitude and latitude lines measure the distance from the Earth's Equator or central axis - running east to west - and the Prime Meridian in Greenwich, England - running north to south.
1.push factor
2.industrialization
3.utban crowding
4.income gap
5.pull factors
