Approximately 15%.
About 15 billion acres, some 20% of the earth's land mass is today considered habitable. That makes 80% at present inhabitable: Antarctica, deserts, mountains and wilderness. But as the case of the Amazon forests shows, forests can be bulldozered and wilderniss can be made habitable. So the figure only reflects today's land needs and state of technology.
The SA mentioned here refers to Surface Area, or how much surface the substance will cover
Only 1% of bacteria is harmful to humans
Cannot answer; depends on the yield, burst height/depth, etc. Some examples of optimal altitude airbursts:Low yield tactical weapon, blast radius < 0.1 mile.Tzar Bomba (over 50MTon yield), blast radius 60 miles.Above or below the optimal altitude the blast radius of an airburst is reduced.Surface and subsurface bursts have much smaller blast radius values than airbursts. A deep enough subsurface burst can be entirely contained and have no effect on the surface (except for a brief earthquake if underground, or millions of tiny radioactive bubbles rising to surface if underwater).
I think 75 pilgrims did , because they have been dying too much of the surface .
If by land mass you mean the surface, then 99% is habitable.
70% or 80% of water covers the earths surface
about 30%
Earths surface of gravity is 4.6m/s2 more than moons.
28 %
The Suns surface is about 6,000K much hotter than the Earths crust. The hottest lava can get at the surface is about 1,400K
Less than 5%.
97%
a lot
Apart form the Oceans the earths surface is made of rocks.
About one third of the land surface of the earth is desert.
about one fourth