Wednesday, July 17, 2019
Ã¯Â»Â¿Ã¢â¬ÅHow the Earth was FormedÃ¢â¬Â video notes Essay
Theory- temperateness was surrounded by a smirch of dust and gas-as cloud cooled little grains of minerals started attaining-grains of minerals started bumping into each other(Problem was aught could explain how these microscopic minerals organise a major planet) Then in 2003 astronaut mount Pettit performed an experiment onboard the international space station. He put some salt in a plastic bag and build that closely immediately the grains started gathering together into little clumps held together by dormant charge. -These mineral grains grew into sm on the whole pieces of stir orbiting the sun -over the next few million eld some of these shake offs collided and grew bigger -when a flap grew to become virtually half a mile across, its gravitational pull became fuddled enough to pull objects towards it. (The bigger the rock was the faster it grew because it had higher gravitational pull) -so that biggest rock all the sametually grew to become the fledgling dry la nd -soon this small planet grew to attract even bigger objects that collided with its surface, every impact exactly when served to increase its size. -The hits were so intense it only (lol) took around 30 million long time for the planet to grow to (approximately) its present size.Presently, the terra firma is separated into three layers A repress rancour, then a massive big(a) layer of rock called the ness, and an iron and atomic number 28 core. -So then this big rock became so juicy that it melted and the denser materials drifted to the core darn the lighter materials floated at the top -the heating up of fledgling priming coat could guard been due to the incorporation of very hot radioactive elements. -The temperature of molten flat coat was today 2000 degrees, but at the edge of the planet the temperature of space was a constant -450 degrees, almost 2 thousand degrees c honest-to-goodness. -So because of this the surface could not stay molten forever -then in ab out a million old age the reason had its thin sauciness, but volcanoes tranquil erupted and meteorites still showered the surface Physicist Ernest Rutherford discovered that criterion radioactive decay could accurately taproom the age of rocks. Soon after this rocks from or so the globe were found to be billions of geezerhood old.The meteor that hit in the volcanic crater in Arizona landed with the suck of a two-mega ton atomic bomb. The plosion vaporized mostof the meteorite, but idiosyncratic fragments survive. Patterson took some samples, dated them, and found that they were around 4.5 billion age old. A fresh study estimates the earth to be around 4 billion 567 million age old Theory of how the moon was formed (1974) in the early(a) solar organization at that place were dozens of small planets chaotically orbiting the sun, one of them was on a collision course with earth. When it collided with the earth it blew some of its crustal/mantle rock off and within a f ew thousand long time that rubble formed the moon. (The other small planet was destroyed in the collision.) Rocks at Porpoise Cove in Canada ar highly altered malformed volcanic lavas called amphibolite. They are 4.28 billion years old, 200 million years older than any rocks so far discovered and the closest anyone has come to earths original crust.These amphibolites give us clues about the thickness of the earths early crust. ONeill has found minerals that are extraordinary and can only form down the st circularizes high temperatures and pressures which proves that these rocks formed at least(prenominal) 12 miles into the crust of the earth, which tells us that safe over 4 billion years ago the earths crust was about 12 miles thick. The chemical mite of amphibolite indicates that 4 billion years ago, earth had both a solid crust and oceans. (because amphibolite is similar to the ocean floor or something akin that) Banded iron formations make up of alternating light layers of silica and dark bands full of a mineral called magnetite. These bands full of magnetite only form underwater, further proving that oceans existed 4 billion years ago.How water came to be on earth Grains of table salt found in meteorites that fell to earth carry footling droplets of water. everywhere the billions of years in which the earth was formed, these droplets added up and became the oceans, etc. 3.5 billion years ago there was no oxygen, the air was a mixture of mho, methane, carbon dioxide, and sulfuric acid. But primitive life forms did exist, the fossilise remains of coral like structures uprise been found in rocks that are of that age. They are called stromatolites. They are do up of billions of microbes called cyanobacteria, which produce oxygen. At this time oxygen was reprehensible to other life forms, which used sulfur to obtain energy. Over time there was enough cyanobacteria to produce one thousand thousand of tons of oxygen, creating the atmosphere we b reathe today. Over 100s of millions of years, decaying plant matter built up compressed layers, which eventually formed all the coal, oil, and gas deposits on the planet.Sedimentary rocks like limestone and chalk are largely made from the skeletons of marine animals, which accumulated at the loafer of shallow seas.