Create a recipe for the world. Geological data is the basis of understanding the origin of the earth
How does our planet form from the surrounding young, dense gas and dust from the original planet disk? What process controls the formation of iron core? What is the origin of the moon? The author puts forward his own hypothesis and supports it with geological evidence. He confirmed that the global magma ocean has been around for more than four billion years, and the elements that entered the earth’s rock are separate. He emphasized the role of magnetic interaction in the original planetary nebula, which may have accelerated the formation of iron-containing planetesimals. The non-uniform growth of this metallic body with magnetic interaction can be much faster than the widely accepted theory of the earth’s fractionation.
The mysterious star of the sky has attracted people’s attention since ancient times, making them think about how the celestial bodies and the earth formed. Because of the scarcity of empirical data, early answers are mysterious and speculative. The development of astronomy provides more factual evidence, and the hypothesis becomes more real. +
About the origin of the earth and the planets have many questions, but the important information about the earth and other celestial bodies geological structure of the concept of the theme for our provided according to the fundamental change.
Stars and planets originate from the gas and dust clouds, similar clouds, which are beginning to relive in the Cari na nebula. NASA, esa, miolio and Hubble’s 20th anniversary team (STScI)
Observations from the Hubble space telescope have revealed some gas and dust nebulae, stars in these nebulae and planets found around some of the stars. Therefore, we can say that the nebula hypothesis of the origin of the solar system proposed by Kant and Laplace in the 18th century has been largely proved. According to the current view, pressure and temperature at the center of such a nebula have led to the conversion of hydrogen into helium, further raising the temperature and leading to the formation of the sun. In general, the gas dust cloud rotates. Particles with the highest rotation speed are attracted less to the center of the cloud due to centrifugal force and remain on the edge. This phenomenon may be related to the cloud’s residual shape and known paradox, that the planet has 98 percent of the angular momentum of the entire solar system, even though they are less than 1 percent of the system’s mass. The pressure of solar radiation has driven most of the gas from near the sun to the edge of the original planet disk, which is why the gas content of the exoplanets (Jupiter, Saturn and Uranus) is high.
Cold or hot? At the same time or in stages?
There are four hypotheses for the growth of earth and other planets: they are formed by the fusion of the original planetary nebulae: cold, heat, homogeneity and heterogeneity. According to the first hypothesis, the particles forming the earth are cold (Schmidt, 1962). Their growth is guided by gravity. It lasted more than a billion years, as O.Yu said. Schmidt, or VS Safronov (1969) 100 million years. Transformation as well as increase of about 23.2 x 10 38 converts mechanical energy into heat energy, enough to heat the earth material to 36000 ° and the evaporation. But, as proponents of the cold product absorption hypothesis argue, the duration of the process is long, allowing heat to be emitted into outer space. Furthermore, the oldest terrestrial rock students assumed that the earliest geological processes were not significantly different from modern geological processes (actual principles). For this reason that cold accretion hypothesis is still widely accepted, although it is mainly based on the calculation of gravitational attraction, and ignores the role of the magnetic force and the current universe chemistry, isotope and geological evidence.
Observations made by astronauts on the moon during the second half of the 20th century were inconsistent with the cold product absorption hypothesis, as they unexpectedly revealed signs of the moon’s heat formation. The moon lacks a chondrite (the composition of the meteorite is similar to that of the earth, and contains round grains of silicate minerals). The moon rocks are pyrogenic, with an isotope age of 4.4-3.7 Ga. For spherical meteorites, the materials accumulated in the remaining melt during the magma crystallization process are greatly enriched: iron oxide, silica and rare earth elements. This fact shows that the young moon is covered by the global magma ocean and then divides. A prominent fact is that there is a 60-100km-thick slanted rock formation. These rocks, which are rare on earth, consist mainly of calcium silicate and calcium. The plagioclase layer on the moon is made up of plagioclase floating in the magma sea, which is 1,000 kilometers deep. So the latest data contradicts the low temperature growth hypothesis of terrestrial planets and points to their heat formation, but the question remains the subject of controversy.
Another unresolved issue involves the formation of homogeneity or heterogeneity of earth and other planets. The accretion hypothesis is that the composition of the material that constitutes the earth is immutable. The silicates and the iron particles fall simultaneously. Then it is separated from the earth by the gravitational fractionation, forming the iron core, the silicate mantle and the crust. According to the non-uniform accretion hypothesis, the composition of falling objects changes over time and determines the stratiform structure of the planet. The homogenous growth hypothesis is attractive to geologists because it does not require any interpretation of the changes in the composition of the bodies. But, as we’ll see below, it doesn’t agree with some theoretical reasoning, cosmic chemistry and geological data.