About 20%. The worlds oceans occupy approximately 4/5 (or 80%) of the worlds surface.
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Approximately 33% of Earth's land area is classified as dry surface, which includes deserts, arid regions, and semi-arid regions. This represents a significant portion of the world's total area.
0% it just seems flat
Because evaporation happens at the surface.
many plants developed a wazy surface cuticle to reduce water loss
Earth has more surface area than Mars. Earth's total surface area is about 510.1 million square kilometers, while Mars has a total surface area of about 144.8 million square kilometers. This means Earth has roughly 3.5 times more surface area than Mars.
Terra firma is the name given to the Earth's dry surface.
Rainforests cover less than 2 percent of Earth's total surface area and are home to 50 percent of Earth's plants and animals (The Nature Conservancy). Rainforests are found all over the world — in West and Central Africa, South and Central America, Indonesia, Southeast Asia and Australia — on every continent except Antarctica. Temperate rainforests consist of coniferous or broadleaf trees and are found in the temperate zones. They are identified as rainforests by the large amount of rain they receive. Mangrove rainforests are, like their name, made of mangrove trees. These trees grow only in brackish waters where rivers meet the ocean. Monsoon rainforests are also called "dry rainforests" because they have a dry season. These get around 31 to 71 inches (800 mm to 1,800 mm) of rain. Up to 75 percent of the trees in dry rainforests can be deciduous.