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Layers of the Earth (FIB) PPT Notes Teacher Version Vocabulary: Inner core – Outer core – Mantle – Crust – Teacher Version – things that you need to know for Tues., 09/15 quiz are highlighted - FIB words are in blue - with additional words you need to add to your note sheet written in red The Crust The Earth’s crust is like the _skin_ of an apple. It is very __thin___ compared to the other three layers. The crust makes up __1%___ of the Earth. tectonic The __crust_ of the Earth is broken into many pieces called _____plates___. The crust is the __outer__ layer It is 5-__100___ km thick There are 2 types of crust: ○ Oceanic (very dense, made of __basalt_) ○ __Continental_______ (less dense, made of granite) The Mantle The mantle is the layer ___below__ the crust. The mantle is the __largest___ layer of the Earth. The mantle is divided into ___2_ regions: the upper and __lower_ sections. Core The core of the Earth is made mostly of very hot (metals) (Fe=iron) 1/3 of the earth’s mass very hot Outer Core The outer core of the Earth is like a ball of very hot metals. The outer core is __liquid_. The outer core is made up of __iron (Fe)__ and is very __dense_. Inner Core The inner core of the Earth has ___temperatures__ and pressures so great that the metals are squeezed together and are not able to move. The inner core is _solid_. The inner core is the DENSEST layer)- The Physical Structure of the Earth Lithosphere – rigid outer layer (crust & very top of mantle); sits on top of asthenosphere what tectonic plates are made of Asthenosphere – semi -solid rock that flows slowly in upper & middle part of mantle where convection currents happen (to re-watch video showing convection currents in the mantle, go to https://www.youtube.com/watch?v=MmMX83diwl0 and watch first 30 sec.) Mesosphere – middle layer - mantle Outer Core – liquid layer Inner Core – solid, very dense