Earth layers

core

Innermost layer of earth. Eath has outer core (liquid) and inner core (solid). Not chemically distinct from each other, but chemically distinct from mantle. Core mainly composed of nickel and iron.

Crust (compositional layer)

Oxygen, silicon, aluminum, and iorn

Asthenosphere (mechanical layer)

ToMoves under lithosphere, pushing and pulling plate tectonics

mesophere

betheath asthenosphere. lower mantle, where, material still flowes buut at much slowere rate than asthenosphere

lithosphere

contains crust and upper portion of mantle

twho tye[es pf [;ates

continental plates, oceanic plates

wgat causes lithospheric plates to move

convection

Layers of the Earth

crust, mantle, outer core, inner core

three compositional layers

earth is composed of three different layers, classificed by eliembts tgat make them (crust, mantle, core)

How do we know what earth looks like on inside

geophysical surveys (seismic data, gravity, magnetics, electrical, geodesy. Aquisition: land, air, sea and satellite Geological surveys: fieldwork, boreholes, mines

Mechanical layers

Earth has five different layers that move differently from one another (lithosphere, asthenosphere, mesosphere, outer core, inner core.

Athenosphere

Bellow lithosphere. VFlowes move like visscous fluod (not liquid) slightly melted plastics) covection happens. Convection currents push and pull lisosheric plates.

Types of layers of the earth

Compositional layers and mechanical layers

lithosphere (mechanical layer)

Crust and top layere of mantle. Plate tectonics.

Why these location for crust

Density

inner core

inner core of earth has temperature and pressures that squeed metals together and are not able to move about like liquid, but are forced to vibrate in place like a solid. Iorn and nickel.

core (compositional layer)

iorn, nickel, and ozygen

outer core

is comprised of liquid iron and nickle, surounds inner core, liquid

continental plates

land is above ocean. Made up mostly of granitic rock (granite formed from cooled lava/magma). Less dense than oceanic crust. (remember less dense things rise up)

mantle

largest layer of earth. Mantle is semi solid, not liquid. Convection happens in mantle.

continental crust

less thick and found abouve the oceans

layers form

lithosphere (solid) Upper mantle (semi solid) Lower mantle (semi solid) Outer core (liquid) inner core (solid)

lithospheric plates

lithosphere of earth is broken into many pices called plates. Plates loat on soft semi solid asthenosphere.

inner core

made of iorn and nickel, pressure causes solid ball at center of earth (inner core)

mesosphere (mechanical layers)

meterial still flowes but at much slowere rate than athenosphere

Oceanic plates

ocean water in above crust. very dense. Made up of basalt rock. more dense than continental crust (more dense things sink)

outer core

outer core is only liquid layer. nickel and iron. flow of liquid metals is responsible for earth's magnetic field.

Mantle (compositional layers)

oxygen, magnesium, silicon, and iron

crust is composed of

two rocks/types by denisty (continental crust and oceanic crust)

oceanic crust

under the ocean, thicker

Convection currents

warm stuff rises, cool stuff sinks. Veryy hot, less dense magma rises up. Magma cools closer to surface, condenses, become more dense and sinks