Answer:1

The specific magnetism of basalt rock is determined by the Earth's magnetic field when the magma is cooling. Scientists determined that the same process formed the perfectly symmetrical stripes on both side of a mid-ocean ridge. Oceanic crust slowly moves away from mid-ocean ridges and sites of seafloor spreading.

Seafloor spreading helps further explain continental drift in the theory of plate tectonics. When oceanic plates diverge, tensional stress causes fractures to occur in the lithosphere. The motivating force for seafloor spreading ridges is tectonic plate slab pull at subduction zones, rather than magma pressure, although there is typically significant magma activity at spreading ridges. Plates that are not subducting are driven by gravity sliding off the elevated mid-ocean ridges a process called ridge push. At a spreading center, basaltic magma rises up the fractures and cools on the ocean floor to form new seabed. Hydrothermal vents are common at spreading centers. Older rocks will be found farther away from the spreading zone while younger rocks will be found nearer to the spreading zone.

Answer:2

There are two sorts of crust, "continental" and "oceanic", which vary in their organization and thickness. The dispersion of these crustal sorts extensively agrees with the division into continental and sea level, albeit mainland racks, which are submerged, are underlain by mainland hull. The mainland has a crust that is comprehensively granitic in composition and, with a thickness of around 2.7 grams for every cubic cm, is to some degree lighter than maritime outside layer, which is basaltic in organization and has a thickness of around 2.9-3 grams for each cubic cm.
The boundary between the "mantle" and the "core" is likewise obviously characterized byseismic studies, which propose that the external part of the centre is a fluid. The impact of the diverse densities of lithosphere rock can be found in the distinctive normal heights of mainland and maritime covering. The less-thick mainland outside has more prominent lightness, making it drift much higher in the mantle. Its normal height above ocean level is 840 meters, while the normal profundity of maritime covering is 3,790 meters. This thickness contrast makes two main levels of the Earth's surface

Answer:3

According to scientists, our bodies are made from remnants of stars and big explosions within the galaxies. At the time of the big Bang, there was simply hydrogen and very little|a touch|a bit} helium and extremely little of anything. helium isn't in our bodies. Hydrogen is, however that is not the majority of our weight. Stars are like nuclear reactors. They convert hydrogen to helium that is converted to Carbon, nitrogen and oxygen, Sulphur, and Iron everything we're made from. Once stars get to the end of their lives, the nuclear reaction stops, and that they calm down, introduce and throw off their outer layers. Some large stars become unstable and explode in a star. Most of the material that we're made from comes out of dying stars, or stars that died in explosions. and those stellar explosions continue. We've got stuff in America as old because the universe, and so some stuff that landed here perhaps solely 100 years ago. and all of that mixes in our bodies. The crucial elements for life on Earth, typically called the building blocks of life, are carbon, hydrogen, nitrogen, oxygen, phosphorus and sulphur. For the first time, astronomers have cataloged the abundance of those elements in a very large sample of stars. The exception is hydrogen, that is around 500th of the atoms of the body which was made presently after the big bang. Everything else is stardust, either produced within the star before it became a supernova, or at the instant of it turning into one