.00003
It is approximately 1/6.
Life has been present on Earth for approximately 85-90% of its 4.6 billion-year history, with evidence of microbial life dating back around 3.5 billion years. This indicates that microbial life existed on Earth for most of its existence.
The earth is only approximately spherical. Its radius ranges from 6353 to 6384 kilometres, with an average value of 6371 km. So the required fraction is 6,194/6,371,000 = 0.000972, approx
about 8%
The land fraction is approx 7/10 and the air fraction is 0.
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 %
Rarefraction
existed since the planet cooled
Approximately 4 Earths would equal the diameter of Uranus
What are two ways that's scientists can study earths climates history
27.7 %
epoch