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Layers of the Earth. Structure of the Earth. Structure of the Earth: series of spheres held together by gravity. * center of Earth is most dense ; it gets less dense as you move outward from the center. Structure of Earth ctd. See pg. 10 of ESRTs.

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Structure of the earth
Structure of the Earth

Structure of the Earth:series of spheres held together by gravity

* center of Earth is most dense; it gets less dense as you move outward from the center


Structure of earth ctd
Structure of Earth ctd

See pg. 10 of ESRTs

* center of Earth is most dense; it gets less dense as you move outward from the center


Structure of the earth ctd
Structure of the Earth Ctd

See pg. 10 of ESRTs

See pg. 10 of ESRTs

Crust:thin, outermost solid layer of the Earth (2 kinds)

a) oceanic: 20–40 km thick; basalt; 3 g/cm3 (MORE dense)

b) continental: 40–65 km thick; granite; 2.7 g/cm3 (LESS dense)

Mantle:thick, mainly solid layer (~ 2800 km thick)

Core:innermost region of the Earth (2 parts)

a) outer core: LIQUID iron (~2200 km thick)

b) inner core: solid iron & nickel (~ 1300 km thick)

Outer core is LIQUID – WRITE this in your ESRTs NOW!!


Structure of the earth continued
Structure of the Earth continued

Lithosphere:the crust & upper part of the mantle (~100 km thick)

* * dense outer shell of Earth composed of rock

Solid rock

* * oxygen & silicon are the 2 most abundant elements

Asthenosphere:lower part of the mantle (~ 500 km thick)

* * NOT brittle like rock; it’s squishy

ductile(plastic putty)

Info on the abovecomes from: a) seismic data (we hit the Earth with waves)

b) meteorites

c) drill holes

d) volcanoes


Surface layer liquid
Surface Layer (liquid)

Pg 1 ESRTS

Hydrosphere:consists of the Earth’s water (H2O)

Hydrosphere:consists of the Earth’s water (H2O)

(oceans, lakes, rivers, etc)

water

* * oceans cover 70% of Earth’s surface (on average ~ 3.8 km deep / thick


Exterior layer gases
Exterior Layer (gases)

Atmosphere:shell of gases surrounding Earth

Pg 14 ESRTs

Pg 14 ESRTs

Extends many km up to the edge of space

It’s layered into temperature zones

Each layer is separated from the next by a “pause” (interface)


Exterior layer gases1
Exterior Layer (gases)

The Atmosphere’s compositionis mainly:

78% nitrogen

21% oxygen

1% other (argon, carbon dioxide, helium, water vapor)

Pg 1 ESRTS


Draw the layers of the atmosphere
DRAW the layers of the atmosphere

Pg. 14 ESRTs

fades out to space

least dense

thermosphere

thermosphere

mesopause

mesosphere

mesosphere

stratopause

density decreases

stratosphere

stratosphere

tropopause

troposphere

troposphere

Earth

only layer w/ water vapor

most dense


Layers of the earth recap
Layers of the Earth - RECAP

** see pg 10 of ESRTs – Inferred Properties of Earth’s Interior…

** see pg 1 of ESRTs – Average Chemical Composition of Earth’s Crust, Hydrosphere and Troposphere

** see pg 14 of ESRTs – Selected Properties of Earth’s Atmosphere


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