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Flashcards in Evidence for Plate Tectonics Deck (17)
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1

What is a fundamental theory of geology that unifies a lot of processes that we observe on our planet?

the theory of plate tectonics

2

the first step in the scientific method is...

to develop a hypothesis

3

if a hypothesis passes a(ny) number of tests then it develops into a ...

theory

4

what did Alfred Wegener propose?

that in the more recent geologic past, (200 million years ago) there was a super continent known as Pangea where all the continents were joined together

5

how many years ago is the more recent geologic past?

200 - 300 million 

6

what was the problem with Alfred Wegener's hypothesis?

it didn't have a mechanism to explain how continents could move across the earth

7

What was evidence used in Wegener's Pangea hypothesis?

- he looked at a map and said Africa and South America fit together like puzzle pieces.

- in the boundaries between South America and Africa there were rocks of similar ages

- in North America, Europe and Africa there are mountain chains of similar ages

-looked at glacial landforms such as glacial striations and tracked the movement of glaciers

- evidence of a single species of tree spread across a number of different continents

8

the fact that Africa and South America fit together like puzzle pieces means that the continental _____ fit

margins

9

why was Wegener's hypothesis broadly rejected in the scientific community?

- he could not explain how these continents spread across the globe, just what 

10

Was Wegener a meteorologist or a geologist?

meteorologist

- this contributed to his hypothesis rejection

- its hard to listen to ideas outside of your field because you just don't afford them the same level of expertise

11

in the boundaries between South America and Africa there were ____ of similar ages

rocks

12

there was evidence of a single species of _____ spread across a number of different continents

tree

13

in North America, Europe and Africa there are _____ chains of similar ages

mountains

14

if you look at continents individually, if South America were by itself it would appear that glaciers were moving from the coast _____, which doesn't happen, so Wegener concluded that the continent of South America must have been an ____ portion of a greater continent.

inland, inner

15

What was the name of the precursor to the theory of plate tectonics?

continental drift hypothesis

16

who proposed the continental drift hypothesis?

Alfred wegener

17

what does Pangea mean? 

'all lands'