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.
For the largest tree in the worldâs fourth place is occupied by the Lincoln Tree, located in Giant Forest, the United States. This tree has a height 256.1 feet (80.0 meters) and volume of 1.259 m3. Tree age is estimated at 2500-3000 years.