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Earth's crustal evolution involves the formation, destruction and renewal of the rocky outer shell at that planet 's surface. The variation in composition within the Earth's crust is much greater than that of other terrestrial planets. Mars, Venus, Mercury and other planetary bodies have relatively quasi-uniform crusts unlike that of the Earth ...
2019年11月13日 · Earth Crust. Edited by: Muhammad Nawaz, Farha Sattar and Sandeep Narayan Kundu. ISBN 978-1-78984-059-9, eISBN 978-1-78984-060-5, PDF ISBN 978-1-83962-802-3
So that's why, when you look at the composition of the earth, you have the densest, the heaviest elements, at the center. And then the lightest elements are forming the atmosphere. And the outer core and the inner core, they are made up predominantly of nickel and iron. And their makeup is actually very similar.
- 10 分鐘
- Sal Khan
2019年11月13日 · The Earth’s crust, along with the upper mantle, has its necessary role in the dynamic creation and destruction of the crustal surface in which all living organisms thrive on. This chapter will look at various aspects of the crust, and it will discuss the origin, structure and composition of the crust before elucidating its continued evolution to this day.
Earth’s crust and upper mantle (to a depth of about 60 kilometers) are divided into about a dozen tectonic plates that fit together like the pieces of a jigsaw puzzle (Figure 8.7). In some places, such as the Atlantic Ocean, the plates are moving apart; in others, such as off the western coast of South America, they are being forced together.
Ang mantle ay tumutukoy sa karamihan ng Earth. Ang crust ay binubuo ng maraming iba't ibang uri ng mga bato na nabibilang sa tatlong pangunahing kategorya: igneous , metamorphic at sedimentary . Gayunpaman, karamihan sa mga batong iyon ay nagmula bilang alinman sa granite o basalt. Ang mantle sa ilalim ay gawa sa peridotite.
