Earth Structure

Question 1

Rheid

Answer 1

A solid that flows

Question 2

What are the 4 classes on the Goldschmidts classification

Answer 2

Lithophile
Siderophile
Chalocphile
Atmophile

Question 3

What is the geothermal gradient

Answer 3

25°C/km

Question 4

Obduction

Answer 4

The overthrusting of oceanic lithosphere onto continental lithosphere at a convergent plate boundary

Question 5

Ophiolite

Answer 5

A section of oceanic crust thrust onto the edge of a continental plate

Question 6

What are body and surface waves

Answer 6

Body: travels through the earths interior

Surface: travel along the earths surface

Question 7

Shadow zone

Answer 7

Areas at the surface where no seismic waves are recorded

103°-143°

Question 8

Epicentral angle

Answer 8

Angle between epicentre and the point at the surface where seismic waves are recorded

Question 9

Define focus and epicentre

Answer 9

Focus: area below the ground where the fault moved

Epicentre: area of the earths surface above the focus

Question 10

Isostacy

Answer 10

The theoretical state of equilibrium between earths lithosphere and aesthenosphere such that the lithosphere floats

Question 11

Isostatic rebound

Answer 11

The rising up of land masses that were once depressed ice sheets

Question 12

Cutie point

Answer 12

Temp at which materials lose their permanent magnetism

Question 13

Sled exciting dynamo

Answer 13

The balance between generation and destruction of the magnetic field

Question 14

Paleomagnets

Answer 14

Ancient magnetism preserved in rocks

Question 15

Magnetic inclination

Answer 15

The angle remnant magnets have relative to magnetic north