Geology Section 8.1 Homework: What is Plate Tectonics?: Due Wednesday, 11/28 or Thursday, 11/29/12

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Please read Section 8.1, pages 172-175. Answer the questions below.

Link for Question #6: http://www.classzone.com/books/earth_science/terc/content/visualizations/es0803/es0803page01.cfm?chapter_no=visualization

Links for Question #7:

Breakup of Pangaea: http://www.classzone.com/books/earth_science/terc/content/visualizations/es0806/es0806page01.cfm?chapter_no=visualization

Plate Tectonic Motion Predicted for the Future: http://www.classzone.com/books/earth_science/terc/content/visualizations/es0807/es0807page01.cfm?chapter_no=visualization

Last Name, First Name *

Period (Do not put nd, rd, or th after the number.) *

Alfred Wegener proposed a ___________________ called continental drift. *

theory

question

hypothesis

law

What is the best definition for a hypothesis? See section 2.2 for the answer. *

an educated guess

an explanation of observable natural phenomena based on evidence for which there is no known deviation

a tentative explanation for an observation or phenomenon that has not been tested

the final step of the scientific method

Alfred Wegener's idea of continental drift became a theory when more evidence was found. What evidence of plate tectonics was found after Alfred Wegener's death in 1930? *

the age of rock on the Atlantic seafloor gets older the farther away you are from the Mid-Atlantic Ridge

locations of earthquakes and volcanoes show a pattern of existing along plate edges when you plot them on a map

the magnetism of rocks on the Atlantic seafloor alternates from North to South to North to South as you go farther from the mid-Atlantic Ridge

fossils on opposing continents are similar

all of the above are correct

only options 1, 2, and 3 are correct

Why was Alfred Wegener's idea of continental drift not accepted by the scientific community? *

Which of the following was NOT an observation made by Alfred Wegener before his death in 1930? *

The continents had similar shapes that fit together like puzzle pieces

Mesosaurus fossils were found on opposing continents in South America and Africa

Rock formations in South America and Africa were similar

Patterns of volcanoes and earthquakes follow plate boundaries

Evidence of glacial striations were found on rocks now existing in tropical areas. This indicates that tropical continents once existed in polar regions.

Go to the plate tectonic animations page linked from the heading above. Observe how alternating magnetic polarity is recorded in rocks at mid-ocean ridges. Explain what happens in this animation that gives evidence to plate tectonic theory. *

Go to the plate tectonic animations page linked from the heading above. Observe an animation of the breakup of Pangaea and examine an animation of plate motion predicted for the future. Describe the general trend in plate motion that you see from 150 million years ago to 100 million years in the future. *

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