Ajutatima sa traduc un text numa nu de pe net .. Multumesc
Earth is the planet which is the third in order from the sun, with an equatorial diameter of 7,926 miles, a polar diameter of 7,900 miles a mass of approximately six sextillion tons, and a mean density of about 5.52 times that of water.
Scientist think that about 4,6 billion year ago a swirling mass of boiling hot rocks and gases, revolving around the Sun, changed into a ball of liquid rock. The ball of rock slowly cooled and a hard crust formet on the outside. At times the hot gases and liquid rock fromi insider broke through the crust in different places. Ths formed mountains and cout deep trenches that later formed the ocean beds.Geological evidence indicate that as the Earth cooled, much of the water vapour present in the atmosphere condensed. There were violent storms and rain poured from the clouds. Rivers and lakes seas and oceans were formed. The oxygen gas (O2) was not present in the early atmosphere and there were no animals yet. Millions of years went by plants began to grow in the seas. As plant grew they produced oxygen. It war released by photosynthesis. Thus due to this process the first animals appeared. They first lived in the sea but when bigger animals developed they crawled out on to the land. The first creatures to come out of the water were the fish that were developing lungs.