8.4

Oceanic Crust

Basaltic rock

Lithosphere

Cool, rigid crust and upper most mantle

Layers defined by composition (May not be same order)

E- Mantle A Contental Crust B Oceanic Crust F, G Core G Inner Core D Asthenosphere F Outer Core C Lithosphere

False

Geoligists concluded that the outer core was liquid because P waves could not travel through it.

Continental Crust

Grantic rock

Outer Core

Liquid iron-nickel alloy that generates earths magnetic field.

Earth's internal structure

Lithosphere-asthenosphere-mesosphere-outer core-inner core

Core

Similar to metallic meteorites

Mantle

Similar to stony meteorites

Asthenosphere

Soft, weak rock with some melting

Inner Core

Solid iron-nickel alloy

Moho

The boundary called _____ separates the crust from the mantle.

Why do P waves bend when they travel into the outer core from the mantle?

The core abd mantle are composed of different material.

True

Until the 1960s scientist had only seismic eveidence they could use to determine the composition of oceanic crust.

Meteorites

_____ That collide with Earth provide evidence of earths inner composition.