CliffsNotes study guides are written by real teachers and professors, so no matter what you're studying, CliffsNotes can ease your homework headaches and help you score high on exams. Brush up on your geography and finally learn what countries are in Eastern Europe with our maps. Depressions in the crust were natural basins in which water, rising from the interior of the planet through volcanoes and fissures, collected to form the oceans. This forced up the silicates that it found there. According to the widely accepted nebular hypothesis, the planets and moons in the solar system, including Earth, formed from a huge cloud of mostly hydrogen and helium. Removing #book# Although the earth has been cooling ever since and has formed a hard outer crust, part of the interior is still hot and molten. Here are the facts and trivia that people are buzzing about. All rights reserved. Earth, along with the other planets, is believed to have been born 4.5 billion years ago as a solidified cloud of dust and gases left over from the creation of the Sun. In the last stage, these large number of small planetesimals aggregate to develop into a smaller number of large bodies called planets. The Precambrian. The following are regarded as the stages in the planets’ development: Get daily news analysis from this link This tiny ball had an extremely small volume, infinite density and temperature. No eyes were around at that time to view the turmoil that must have taken place on the face of Earth—gigantic heaves and bubblings on the surface, exploding volcanoes, and flowing lava covering everything in sight. Updated February 11, 2017 | Infoplease Staff. Immanuel Kant, a German philosopher, gave this theory. The Earths Structure. In 1796, a mathematician Pierre-Simon Laplace reexamined it. Earth's mass is approximately 5.973x1024 kg, and its mean density is 5.515 g/cm^3. After many years, the iron reached the center, almost 4,000 mi deep, and began to accumulate. . Slowly, Earth acquired its present appearance. Earth, along with the other planets, is believed to have been born 4.5 billion years ago as a solidified cloud of dust and gases left over from the creation of the Sun. Infoplease knows the value of having sources you can trust. Learn more about the mythic conflict between the Argives and the Trojans. Contraction, rotation, and dropping temperatures resulted in the formation of … NCERT notes on important topics for the UPSC civil services exam. The main ingredients, according to the best available evidence, were iron and silicates, with small amounts of other elements, some of them radioactive. the Earth's surface, but the study of the ocean floors, and the interior of the Earth. from your Reading List will also remove any Scientific Theories of the Origin of the Earth By: Haseeb Jamal / On: Mar 02, 2017 / Notes There are various scientific theories of origin and evolution of the earth https://byjus.com/free-ias-prep/daily-news-analysis/2019-cna/, Your email address will not be published. We've got you covered with our map collection. and any corresponding bookmarks? Earth's radius is about 6,371 km and the radius of the core is about 3,486 km (the inner core radius is about 1,217 km&endash; a little more than two-thirds of the radius of the Moon). Earth – Origin & Evolution (UPSC Notes):-Download PDF Here. Check our encyclopedia for a gloss on thousands of topics from biographies to the table of elements. After this, the cloud of the gas condenses and the matter over the core is changed into tiny rounded objects. At the Big Bang, this ball blasted fiercely and forcefully and started a substantial process of expansion which continues to this day. FEN Learning is part of Sandbox Networks, a digital learning company that operates education services and products for the 21st century. Revised Nebular Hypothesis was propounded by Carl Weizascar in Germany and Otto Schmidt in Russia. Immanuel Kant, a German philosopher, gave this theory. Early Theories. It is not only the study of the Earth as we see it today, but the history of the Earth as it has evolved to its present condition. Contraction, rotation, and dropping temperatures resulted in the formation of small particles, the first being nickel and iron. These notes will also be useful for other competitive exams like banking PO, SSC, state civil services exams and so on.
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