Earth's Interior

Front 1

What are the different paths of seismic waves?

Back 1

Strong curved paths, Reflected waves, Double reflection, diffracted waves, refracted waves.

Front 2

What do seismic wave velocities help seismologists conclude?

Back 2

That the Earth must be composed of distinct shells.

Front 3

What are the layers in Classical Earth Composition?

Back 3

Crust, Mantle, Core

Front 4

What are the layers in Modern Earth Composition?

Back 4

Lithosphere, Asthenosphere, Mesosphere, Outer Core, and inner Core.

Front 5

How many layers does the Classical Composition of the earth have?

Back 5

3

Front 6

Define Crust

Back 6

The thin outer skin that ranges from 3 kilometers at oceanic ridges to 70 kilometers in some mountain belts.

Front 7

Define Mantle

Back 7

A solid rocky shell that extends to a depth of about 2900 kilometers.

Front 8

Define Core

Back 8

An iron-rich sphere having a radius of 3486 kilometers.

Front 9

Depending on temperature and depth, Earth may behave?

Back 9

like a brittle, solid, a plastic like matter, or melt and become a liquid.

Front 10

How many layers does the Modern Composition of the Earth have?

Back 10

5

Front 11

Define Lithosphere

Back 11

Earth's outermost layer, consists of crust and upper mantle, cool temperature, rigid shell.

Front 12

Define Asthenosphere

Back 12

Beneath the lithosphere in the upper mantle, the lithosphere moves independently of the atmosphere.

Front 13

Define Mesosphere

Back 13

Rigid layer in the lower mantle

Front 14

Define Outer Core

Back 14

Composed of mostly iron-nickel alloy, liquid layer, generates Earth's magnetic field.

Front 15

Define Inner Core

Back 15

Stronger than the outer core, behaves like a solid.

Front 16

What are the properties of the Modern Composition Layers?

Back 16

Rigid Lithosphere, Plastic Asthenosphere, Rigid Mesosphere, Liquid Outer Core, Solid Inner Core.

Front 17

What are the two major boundaries?

Back 17

The Moho & The core-mantle boundary

Front 18

Define The Moho

Back 18

Discovered in 1909 by Andrija Mohorovicic, separates crust from the mantle, identified by a change in P-wave velocity.

Front 19

Define The Core-Mantle Boundary

Back 19

Discovered in 1914 by Beno Gutenberg, based on observation of P-Wave shadow zones. Also caused S-wave shadow zones.

Front 20

P-wave shadow zones

Back 20

pass through the outer and inner core

Front 21

S-wave shadow zones

Back 21

Reflect off of the outer core

Front 22

What are two kinds of crusts

Back 22

Continental crust & Oceanic crust

Front 23

Define Oceanic Crust

Back 23

Thin and dense

Front 24

Define Continental crust

Back 24

thick and buoyant.