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It is thought that life could not have existed on land until the ozone layer formed about 2 billion years ago. Why does life on land require an ozone layer?
Wiki User
∙ 11y ago
Because the ozone layer provides a thin layer of protection from the harmful UV rays or ultraviolet rays.
Wiki User
∙ 11y ago
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How long has the earth existed for?
4.6 billion years ago the earth was formed
What continent formed in 0.7 billion years ago?
Rodinia was the continent that existed 0.7 bya.
Is it through that life could not have existed on land until the ozone later formed about 2 billion years ago why does life on land require an ozone layer?
Life on earth requires an ozone layer. It is because it absorbs the fatal UV rays of the sun.
When did land start to exist on earth?
The Earth formed some 4 to 5 billion years ago. Solid land formed as it cooled about 2.5 and 3.8 billion years ago. No seas existed until the Earth had cooled enough not to boil water back into vapour.
How long has the earth been here?
Current estimate of the Earth's age is about 4.5 billion years. The total age of the Universe (Big bang until now) is about 15 billion years.
Scientist believe that the more distant galaxies are formed when?
Far or near, all galaxies were thought to be formed in the first half billion years of the formation of the universe ... that is, about 13 billion years ago. Note that we're seeing the distant ones in a younger stage of development.
What is meant by ganadwanaland?
Gondwanaland ?Its the continent that existed about half a billion years ago and was formed from what now is South America, Africa, Antarctica , Australia, Arabia, Madagaskar, New Guinea and India.
When did Mrcury become a planet?
The planet Mercury, along with the other planets in our solar system, is thought to have formed about four and a half billion years ago.
Were rocks that are 3.5 billion years present when earth was first formed?
No, rocks that are 3.5 billion years were not present when earth was first formed. Earth formed about 4.6 billion years ago.
How was God formed?
Christians believe that God has always existed, He was not formed.
Billions of years ago galaxies existed in?
Galaxies. They are just about the same now as they were then. 14 Billion years ago, astronomers believe that the "Big Bang" created matter from energy, which is how they believe galaxies were formed.
Was there a gap between making of heaven and earth and light and creation on earth?
Well the heavens (the universe) and earth were made several billion years apart. Light on earth existed when earth was formed as the sun existed then. Obviously when life began on earth there was light already existing (the sun)
