Conditions that promote karst development are well-jointed, dense limestone near the surface; a moderate to heavy rainfall; and good groundwater circulation. Limestone (calcium carbonate) dissolves relatively easily in slightly acidic water, which occurs widely in nature.
Crowther said first he had to figure out how many trees are on Earth and that number was far more than anyone expected: 3.04 trillion trees, according to a study published Wednesday in the journal Nature. 14 Photos Trees Around The World.
Latest World census figures as of Dec. 10, 2008 = 6,867,020,300 people living on Earth as of today. Divide the acres of land by the number of people and you get = 5.36 acres of land for every single person on Earth. I would like to request my land be on a Hawaiian beach and not Antarctica, thanks!! Source(s): davehuckleberry_55 Â· 7 years ago.