theory of plate tectonics

Question 1

who created the theory of plate tectonics?

Answer 1

Wegner

Question 2

what did he state about the continents?

Answer 2

that 300 million years ago there was a super continent called pangea that has split over time into two and present day is due to further splitting
his theory of continental drift was not accepted for a while due to lack of evidence

Question 3

describe the earths core

Answer 3

solid inner core and molten outer one

Question 4

describe the mantle

Answer 4

made up of molten and solid rocks, lighter elements such as silicone

Question 5

describe the crust

Answer 5

lighter than the mantle, has two types oceanic and continental

Question 6

what is the crust and upper mantle split into?

Answer 6

the lithosphere and athenospere

Question 7

describe the lithosphere

Answer 7

broken into rigid plates that do bend but cannot flow
rides on top of Asphere
made up of crust and upper mantle

Question 8

describe the asthensphere

Answer 8

rocks are semi rigid and can flow in response to deformation

Question 9

is there a chemical difference between Lsphere and Asphere?

Answer 9

no once the Asphere cools it becomes the Lspere

Question 10

what is the geographical evidence for the theory?

Answer 10

‘jigsaw fit’, comparing continental coasts across the Atlantic shows that they could have fit together ( North america and Africa_

Question 11

what continents show evidence for the jigsaw fit?

Answer 11

north america and Africa

Question 12

what is the biological evidence for the theory?

Answer 12

fossil remains of the mesosaurus have been found in S america and S Africa

Question 13

what fossil has been found?

Answer 13

mesosaurus

Question 14

what is the climatological evidence?

Answer 14

glacial deposits in India, S america and Africa and similar and glacial striations in Brazil and w Africa indicate flow away form equator to poles

Question 15

where have glacial deposits been found?q

Answer 15

India, s America and Africa

Question 16

where is there evidence of glacial striations?

Answer 16

Brazil w Africa

Question 17

what is paleomagnitism?

Answer 17

sea floor spreading, as sea floor opens magma rises and solidifies with iron particles pointing north, as the poles switch every 400,000 years this has caused stripes

Question 18

what is polar wandering?

Answer 18

when the poles switch

Question 19

how often does polar wandering occur?

Answer 19

400,000 years

Question 20

`what does paleomagnitism show about the theory?

Answer 20

that the floor is spreading and places are moving

Question 21

how hot is the earths core

Answer 21

3700 degrees

Question 22

where do convention currents take place?

Answer 22

in the mantle