4
27.7 %
only about 3 % is fresh water and less than 1 percent of that is available the rest is frozen in glaciers etc
That depends on how long ago humans developed. Assume 100,000 years, the earth is about 4,000,000,000 years old. So% = 100,000 / 4,000,000,000 x 100 = 0.0025 %
All land combined covers about 30% of Earth's surface.
yes this is true.
no not really
Water.
hydrosphere
Part of earth's hydrosphere
The elements that are in Earths Hydrosphere is Oxygen with 33.0% of volume, Hydrogen with 66.0% of volume, and 1.0% of unknown elements.
hydrosphere
hydrosphere
No. It is part of the hydrosphere.
no not really
hydrosphere
The hydrosphere encompasses all of Earth's water.