2.5 billion years ago our planet was almost completely covered by water,
with land making up only 2 to 3 per cent of its surface.
Earth’s mantle was up to 200 °C hotter, because there was then a larger quantity of radioactive elements decaying and producing heat.
Then, as the mantle cooled, land would have gradually appeared, this transition may help to explain why levels of oxygen in the atmosphere rose.
Today, 28 per cent of Earth’s surface is above sea level.
71 percent of the Earth's surface is water-covered.
Oceans hold about 96.5 percent of all Earth's water.
Earth reflects blue light it appears blue from space, and is referred
as the blue planet.
Remaining 3.5 % of water exists in the air as water vapor, in rivers
and lakes, in icecaps and glaciers, in the ground as soil moisture and
in aquifers, and in animals and plants.
Water is never still earths water is constantly moving from one form to another.
The volume of all the earths water would be about 1,385 kilometers in
spherical diameter.
would be about 1,386,000,000 cubic kilometers (km3)
https://goo.gl/aEl0aU
http://metro.co.uk/2008/12/31/early-earth-was-covered-in-water-274995/
https://www.newscientist.com/article/mg20126882-600-ancient-earth-was-a-barren-waterworld/amp/
https://en.wikipedia.org/wiki/Water_distribution_on_Earth
https://www.youtube.com/watch?v=ys5hmBkyvag
https://www.youtube.com/results?search_query=formation+of+earth+birth+water
http://dx.doi.org/10.1016/j.epsl.2008.08.029
https://water.usgs.gov/edu/earthhowmuch.html
https://www.fcwa.org/story_of_water/html/earth.htm
Planet Earth In a Nutshell
https://m.youtube.com/watch?v=JGXi_9A__Vc
The Birth of Planet Earth - New Documentary 2015
Discovery channel
https://m.youtube.com/watch?v=A4r58o4cSh0
with land making up only 2 to 3 per cent of its surface.
Earth’s mantle was up to 200 °C hotter, because there was then a larger quantity of radioactive elements decaying and producing heat.
Then, as the mantle cooled, land would have gradually appeared, this transition may help to explain why levels of oxygen in the atmosphere rose.
Today, 28 per cent of Earth’s surface is above sea level.
71 percent of the Earth's surface is water-covered.
Oceans hold about 96.5 percent of all Earth's water.
Earth reflects blue light it appears blue from space, and is referred
as the blue planet.
Remaining 3.5 % of water exists in the air as water vapor, in rivers
and lakes, in icecaps and glaciers, in the ground as soil moisture and
in aquifers, and in animals and plants.
Water is never still earths water is constantly moving from one form to another.
The volume of all the earths water would be about 1,385 kilometers in
spherical diameter.
would be about 1,386,000,000 cubic kilometers (km3)
https://goo.gl/aEl0aU
http://metro.co.uk/2008/12/31/early-earth-was-covered-in-water-274995/
https://www.newscientist.com/article/mg20126882-600-ancient-earth-was-a-barren-waterworld/amp/
https://en.wikipedia.org/wiki/Water_distribution_on_Earth
https://www.youtube.com/watch?v=ys5hmBkyvag
https://www.youtube.com/results?search_query=formation+of+earth+birth+water
http://dx.doi.org/10.1016/j.epsl.2008.08.029
https://water.usgs.gov/edu/earthhowmuch.html
https://www.fcwa.org/story_of_water/html/earth.htm
Planet Earth In a Nutshell
https://m.youtube.com/watch?v=JGXi_9A__Vc
The Birth of Planet Earth - New Documentary 2015
Discovery channel
https://m.youtube.com/watch?v=A4r58o4cSh0
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