Earth's 3 Layers
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What are the Earth’s three layers?
Crust, Mantle, and Core
It is thin and the topmost layer of the Earth.
Crust
What is the uppermost layer who’s name is derived from the first two letters of the two most abundant elements found in it?
Sial (Silicon Aluminum)
What is the lower crust made up of mostly of Silicon and Magnesium?
Sima
What are the Earth’s thin, rocky crust’s two different types?
Continental and Oceanic Crust
What crust is composed of granitic rock?
Continental Crust
What crust is composed of dark igneous rock basalt?
Oceanic Crust
Separating the crust and the Earth’s second layer is the boundary called _________?
“MOHOROVICIC DISCONTINUITY”
Who discovered the Mohorovicic Discontinuity in 1909?
a Croatian scientist named Andrija Mohorovicic
What layer compromises 82% of the Earth’s volume?
Mantle
What mantle is made up of solid rocks and together with crust known as lithosphere?
Upper Mantle
What mantle is the weaker region of semi-solid or plastic known as asthenosphere?
Lower Mantle
Marking the boundary between the solid mantle and the Earth’s third layer is the _______?
“GUTENBERG DISCONTINUITY”
Who discovered the Gutenberg Discontinuity?
a German seismologists named Beno Gutenberg
What composition is an iron-nickel alloy with minor amounts of oxygen, silicon, and sulfur elements that readily form compounds with iron?
Core
What are the cores two regions?
Outer and Inner Core