History of Life on Earth Flashcards
when did earth form?
earth formed 4.6 billion years ago along with the rest of the solar system.
what did it form from?
the earth formed from the condensing of a cloud of dust and rocks that surrounded the young sun.
why was life not possible during earths early formation?
life was not possible during earths early formation because of the continuous bombardment by rocks and ice. these crashes made the surface too hot and unstable, this vaporized water, and destroyed any chance for life to start.
what happened when the bombardment slowed down?
when the bombardment slowed down, the earths surface cooled down forming a solid crust, water vapor condensed leading to the formation of oceans, and conditions became more stable, making it possible for life to start developing.
most biologists now believe?
conditions on early earth could have made it possible for simple cells to have arose.
one hypothetical scenario has proposed this could have occurred through 4 main stages:
