chapter 17: plate tectonics - · pdf file1 chapter 17: plate tectonics section 17.1 drifting...
Post on 06-Mar-2018
220 Views
Preview:
TRANSCRIPT
1
CHAPTER 17: PLATE TECTONICS
Section 17.1 Drifting Continents
1. Analyze the growth of the continental drift theory by summarizing contributions by
each person in the table below.
Name
Alfred Wegener
Nationality
Austrian
Date Late 1500s
Profession
Observation
Built on matching
coastline
observations by
other people
Built upon
observations by
other people
Proposed
Explanation
2. Create three diagrams to show how it is thought that the continents drifted. Use
figure 17.2 to help you draw what Earth looked like 200 million years ago, 135
million years ago, and in the present.
200 million years ago 135 million years ago present
2
3. Analyze the evidence Wegener had supporting his hypothesis of continental drift.
Evidence Concept/Idea Examples of Evidence
Rock Evidence
Fossil Evidence
Climate Evidence
4. Identify 2 reasons why scientists rejected Wegener’s hypothesis of continental drift.
________________________________________________________________________
________________________________________________________________________
________________________________________________________________________
________________________________________________________________________
3
Section 17.2 Seafloor Spreading
1. Organize information about ocean floor topography by completing the following flow
chart.
2. Predict where the oldest rocks in the Atlantic Ocean are. Predict where the youngest
rocks are. Use maps in your text as a resource.
________________________________________________________________________
________________________________________________________________________
________________________________________________________________________
3. Imagine you lived 1 million years ago. Predict how you would use a compass for
navigation.
________________________________________________________________________
________________________________________________________________________
________________________________________________________________________
4. Illustrate magnetic symmetry around an ocean ridge. Use Figures 17.12 and 17.13 to
help you. Show the following features:
-ocean ridge -areas of normal polarity
-areas of reversed polarity -relative ages of rocks
Topographic features on the ocean floor.
Earthquakes
and
volcanoes are
common
Deepest spot
in the ocean
is 11 km
deep.
4
5. Organize information about seafloor spreading by completing the following cycle
diagram.
6. Synthesize. Suppose you could measure the distance between New York and London
and between Los Angeles and Singapore over several thousand years. Describe how
those distances would change compared to their distances today.
________________________________________________________________________
________________________________________________________________________
________________________________________________________________________
________________________________________________________________________
Plate moves outward from
the ridge.
Magma pushed into ocean ridge
5
Section 17.3 Theory of Plate Tectonics
Plate Boundary
Type
Illustration Plate Movement Associated Geologic
Phenomena
New Features
Formed
Divergent
Convergent
(oceanic-oceanic)
Convergent
(oceanic-continental)
Convergent
(continental-
continental)
6
17.4 Causes of Plate Motion
1. Identify the factors that cause convection, describe the movement of a convection
current, and sketch a current.
________________________________________________________________________
________________________________________________________________________
________________________________________________________________________
________________________________________________________________________
________________________________________________________________________
2. Compare the processes of ridge push and slab pull by filling in the table below.
Type of plate
boundary
Description of
movement
Impact on plate
tectonics
Ridge Push
Slab Pull
3. Create a diagram to illustrate ridge push and slab pull. Use Figure 17.22 to help you.
7
8
top related