According to some earth scientists, core formation happened very early in the history of the Earth, perhaps within the first hundred million years after the planet formed. During this period, a solid, inner core and a semi liquid outer core took shape. Most scientists believe this inner core is still heated by warmth left over from the collision and accretion of the many asteroids and meteors that originally formed the planet. Scientists now estimate that the Earth's solid-iron, inner core is about miles across, about the same size as the moon.
The liquid iron, outer core is about miles across. Mantle Back to Top. Comparing the Earth with a giant, hard boiled egg means the mantle is like the egg's thick, squishy white part. As the planet cooled and the heavy iron fell to the center, the lighter silicate rocks floated in the mantle above.
Silicate include all kinds of rocks, usually containing the elements silicon and oxygen. Earth's mantle is believed to be made up of mostly silicate rocks. Rocks in the mantle look more like those typically found at the Earth's surface. However, these rocks are kept warm by both the decay of radioactive elements and by the heat from the core.
Because they are also subjected to pressure from the crust above, they tend to be semi liquid or viscous. The mantle, like the core, is thought to have formed very early in the history of the Earth. Many earth scientists divide the mantle into the upper and lower mantle based on the properties and behaviors of the different rocks.
Crust Back to Top. If the Earth is a giant, hard boiled egg, then the crust of the Earth is like the thin, brittle eggshell. Unlike the core and the mantle, the Earth's crust did not form from heavy and light elements that separated themselves early in Earth's history.
Instead, the crust is constantly formed, destroyed and reformed by processes happening inside the mantle. The rocks in Earth's crust are primarily basalts and granites. Basalt are gray or black, fine textured, heavy rocks. Granites are not so heavy pink, gray or black rocks. The crust contains many other elements including sodium, aluminum, potassium and iron. It is under such extreme pressure that it is solid, even though it gets as hot as degrees C. It has a radius of about km. The inner part of the earth is the core.
This part of the earth is about 1, miles 2, km below the earth's surface. The core is a dense ball of the elements iron and nickel. The layer above the core is the mantle. It begins about 6 miles 10 km below the oceanic crust and about 19 miles 30 km below the continental crust. The crust lays above the mantle and is the earth's hard outer shell, the surface on which we are living. In relation with the other layers the crust is much thinner. It floats upon the softer, denser mantle.
The crust is made up of solid material but these material is not everywhere the same. Expert Answers cburr Certified Educator. There are four main layers in the earth. Related Questions In which layer of earth do people live? It begins about 6 miles 10 km below the oceanic crust and about 19 miles 30 km below the continental crust The crust lays above the mantle and is the earth's hard outer shell, the surface on which we are living.
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The crust sits atop the mantle, although the liquid magma of the mantle sometimes breaks through. When this magma cools, it hardens into part of the outer crust. In some places, like the bottom of the ocean, the crust is quite thin.
This part of the earth is about 1, miles (2, km) below the earth's surface. The core is a dense ball of the elements iron and nickel. The layer above the core is the mantle. Chemically, the earth’s surface can be divided into crust, upper mantle, lower mantle, outer core and inner core. Inner core The solid inner core has the radius of nearly km, suspended in .
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