The internal structure of the Earth is made up of the asthenosphere, the upper mantle, the lower mantle, the outer core and the inner core. These structures support the crust of the Earth.Know More
The asthenosphere is a semisolid layer of hot rock that's found at the top of the upper mantle. It is thinner beneath the oceanic crust and thicker beneath the terrestrial crust. The transition between the crust and the upper mantle is known as the Mohorovi?i? discontinuity, or the Moho.
The mantle proper makes up most of the Earth's internal structure. The upper mantle is about 410 miles thick. Earthquakes don't originate deeper than this.
Another discontinuity separates the upper mantle from the lower mantle, which then extends down to 1678 miles to the outer core. At these depths, the pressures and heat change the nature of the rocks. There are also a couple of discontinuities, including the mysterious D double prime. There, the rocks are subject to pressures of as much as 20 million pounds per square inch.
The core of the Earth is in its center. The outer core is liquid, a little over 1300 miles in diameter and made of an alloy of nickel and iron. The inner core is about 760 miles in diameter and is made of solid iron.Learn more about Earth Science
While no one knows for certain how the Earth formed, scientists theorize that it formed over 4 million years ago after the sun went through its initial formation, gravity began to draw heavy particles together into a planet and solar winds blew away lighter gases. These heavy particles became the core of the planet. As the mass continued to grow, heavier particles sank to the center, according to Space.com.Full Answer >
In the year 1515, Nicolaus Copernicus theorized that the Earth was a planet and discovered the idea of a heliocentric solar system, a system in which all planets revolved around the sun. He built his own observatory in 1513 to help him watch the actions of planets.Full Answer >
The volume of the Earth is 1.44 x 10^21 cubic yards or 2.63 x 10^10 cubic miles. This is found by taking the diameter of the Earth, which is roughly 7,962 miles at the equator, and applying the formula, V = 4/3 pi r^3.Full Answer >
Scientists agree that the Earth formed about 4.6 billion years ago out of accreted matter from the solar nebula. All planets in the solar system formed the same way. Once the proto-Earth was formed, many changes occurred over vast timescales to produce the Earth of the 21st century.Full Answer >