The shape and geology of the continents suggests that they were once joined together.
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1 Drifting Continents
2 Section 17.1 Drifting Continents The shape and geology of the continents suggests that they were once joined together. Review Vocabulary hypothesis: testable explanation of a situation
3 I. Early Observations A. Abraham Ortelius 1. Dutch cartographer 2. Noticed the apparent fit of continents on either side of the Atlantic Ocean a. North America and South America had been separated from Europe and Africa by earthquakes and floods.
4 B. Antonio Snider-Pelligrini 1858 Maps Pg. 468 Fig. 17.1
5 C. Alfred Wegener 1. Proposed moving continent hypothesis
6 II. Continental Drift A. Alfred Wegener s hypothesis 1. All continents were once joined together 2. Pangaea a. All Lands b. Break-up began 200 million years ago 3. The Origin of Continents & Oceans
7 Pangaea223
8 What is Pangaea? A. the name of a German scientist B. the name of the supercontinent that existed millions of years ago C. another name for continental drift D. the name of an ancient fossil 0% 0% 0% 0% A. B. C. D.
9 B. Evidence from Rock Formation 1. Mountain ranges a. Rock types in S. America & Africa b. Appalachian mountains and Greenland
10 C. Evidence from Fossils 1. Land animals a. Cynognathus b. Lystrosaurus 2. Fresh Water Reptile a. Mesosaurus
11 D. Climatic evidence 1. Tropical plant fossils found in the arctic a. Glossopteris
12
13 According to Wegener s hypothesis of continental drift, A. Earth s surface is made up of seven major landmasses. B. the continents do not move. C. Earth is slowly cooling and shrinking. D. the continents were once joined together in a single 0% 0% 0% 0% landmass. A. B. C. D.
14 continental221drift
15 2. Coal deposits a. Existence of coal beds in Antarctica b. Form in tropical climates Pg. 470 Fig. 17.3
16 3. Glacial Deposits a. Africa, India, Australia, S. America b. Once located near South Pole Fig Pg. 471
17 Section 17.1 Drifting Continents Continental Drift
18 Which type of evidence was NOT used by Alfred Wegener to support his continental drift hypothesis? A. evidence from landforms B. evidence from fossils C. evidence from human remains D. evidence from climate 0% 0% 0% 0% A. B. C. D.
19 III. A Rejected Notion Although Wegener had compiled an impressive collection of data, the hypothesis of continental drift was never accepted by the scientific community. Two unanswered questions what forces could cause the movement and how continents could move through solids were the main reasons that continental drift was rejected.
20 III. Wegener s hypothesis rejected A. Couldn t explain how continents moved B. How could continents move through Earth s solid crust C. Geologists also rejected his mountain formation ideas
21 Most geologists rejected Alfred Wegener s idea of continental drift because A. they were afraid of a new idea. B. Wegener was interested in what Earth was like millions of years ago. C. Wegener used several different types of evidence to support his hypothesis. D. Wegener could not identify a force that could move the continents. 0% 0% 0% 0% A. B. C. D.
22 The shape and geology of the continents suggests that they were once joined together. The matching coastlines of continents on opposite sides of the Atlantic Ocean suggest that the continents were once joined. Continental drift was the idea that continents move around on Earth s surface.
23 Wegener collected evidence from rocks, fossils, and ancient climates to support his theory. Continental drift was not accepted because there was no explanation for how the continents moved or what caused their motion.
24 Which scientist proposed that the continents moved, or drifted, to their present locations? A. Friedrich Mohs B. James Hutton C. Alfred Wegener D. Vladimir Köppen 0% 0% 0% 0% A. B. C. D.
25 Which type of fossil on widely separated continents would provide the best evidence that the continents have drifted? A. a fossil of a marine fish B. a fossil of a migratory bird C. a fossil of a land reptile D. a fossil of a marine clam A. 0% 0% 0% 0% B. C. D.
26 Why was the hypothesis of continental drift at first rejected by most scientists? Answer: Alfred Wegener accumulated substantial evidence supporting the movement of continents, but he could not adequately explain how the continents could move or what force could cause the movement. Without a driving mechanism, the hypothesis was rejected by most scientists.
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