How was the layered structure of the earth developed

Asked by admin @ 17/08/2021 in Geography viewed by 275 People

How was the layered structure of the earth developed?

Answered by admin @ 17/08/2021

Answer:

Dense materials sank to the center, forming an iron-nickel rich core. Lighter buoyant silicate-rich magma rose to the surface. The remaining material between the core and the magma formed Earth's thickest layer, called the mantle,which is composed mainly of iron, magnesium, calcium-rich silicate minerals

Fundamental Geologic

Earth�s Formation and its Interior Structure

Earth formed about 4.6 billion years ago during the birth of our solar system. This date comes from meteorites and moon rocks. For several hundred million years after the formation of the solar system the planets were continuously bombarded by meteoric debris thus the surface of the Earth probably remelted repeatedly by the impacts of large asteroids. This early bombardment continued until about 3.8 billion years ago.

During the next major phase of earth’s formation cooling and differentiation of the Earth’s layers occurred. Dense materials sank to the center, forming an iron-nickel rich core. Lighter buoyant silicate-rich magma rose to the surface. The remaining material between the core and the magma formed Earth’s thickest layer, called the mantle,which is composed mainly of iron, magnesium, calcium-rich silicate minerals

Cross sectional view of Earth

Figure 1: Cross sectional view of Earth illustrating its heterogeneous layers. (image from Beatty, J. K. and A. Chaikin, eds. The New Solar System. Massachusetts: Sky Publishing, 3rd Edition, 1990.)

Click to enlarge.

Eventually, the magma cooled to form a thin layer of silica/aluminum-rich crust . Oceanic crust is composed of dense basalt and gabbro. Continental crust is less dense and has a granitic composition overall.

How was the layered structure of the earth developed

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