Lesson 2- Development of Wegener's theory

Question 1

When did Wegener publish his theory?

Answer 1

1912

Question 2

According to Wegener’s predictions, when did Pangea exist?

Answer 2

300 million years ago

Question 3

In which era did Pangea exist

Answer 3

Permian era (225 million years ago)

Question 4

How many continents did Pangea split into?

Answer 4

2 continents

Question 5

Which two continents did Pangea split into?

Answer 5

Laurasia in the North
Gondwanaland in the south

Question 6

Improvements in what two activities supported wegener’s idea of uplift and folding caused by colliding continental masses?

Answer 6

Rock and fossil dating
Discovery of marine fossils in some of the worlds great mountain chains

Question 7

When did nuclear submarines begin to monitor and map the ocean floors with great accuracy?

Answer 7

1950s

Question 8

What was discovered when Submarines started mapping the ocean floor?

Answer 8

Mid-Atlantic Ridge an underwater chain-discovered 1948

Question 9

How many km wide was the North Atlantic ridge?

Answer 9

1000km

Question 10

What height does the mid Atlantic ridge reach?

Answer 10

2.5 km

Question 11

Ridges and Ocean trenches were found to be what?

Answer 11

seismically active

Question 12

In 1962 which American scientist updated Wegener’s ideas?

Answer 12

Harry Hess

Question 13

What did Harry Hess study?

Answer 13

The age of the rocks

Question 14

What did Harry Hess find when researching the age of the rocks?

Answer 14

Youngest rocks were in the middle and the oldest rocks were closer to the USA