Origin of Earth
-Living things(organisms)
water, food, oxygen, Co2, soil, sun
About 4.5 million years ago, Earth formed out of nebula of gases and dust that were to become the solar system.
Small objects-called planetoids-combined together to build larger objects...such a planets.
The First Atmosphere
-mainly hydrogen and helium, atmosphere lost for 2 reasons
-1. the gravity of the modest size earth was not strong enough to prevent such light gases from escaping to space. Particuraly since the early earth was hot!
Earth as Hell
-the surface of the earth during this period was extremely hot with numerous volcanoes
-the earth was under near constant bombardment by objects of varying sizes
-Slowly, the earth started to cool down and the second atmosphere began to form
Earth's Second Atmosphere
-a new atmosphere was established by the outgasig of volcanos...the mixture of gases was probably similar
-Virtually no oxygen in that second atmosphere
-Thus, no ozone layer, so ultraviolet
-Living things(organisms)
water, food, oxygen, Co2, soil, sun
About 4.5 million years ago, Earth formed out of nebula of gases and dust that were to become the solar system.
Small objects-called planetoids-combined together to build larger objects...such a planets.
The First Atmosphere
-mainly hydrogen and helium, atmosphere lost for 2 reasons
-1. the gravity of the modest size earth was not strong enough to prevent such light gases from escaping to space. Particuraly since the early earth was hot!
Earth as Hell
-the surface of the earth during this period was extremely hot with numerous volcanoes
-the earth was under near constant bombardment by objects of varying sizes
-Slowly, the earth started to cool down and the second atmosphere began to form
Earth's Second Atmosphere
-a new atmosphere was established by the outgasig of volcanos...the mixture of gases was probably similar
-Virtually no oxygen in that second atmosphere
-Thus, no ozone layer, so ultraviolet