Answer #7 please
Applications and Investigations in Earth Science (9th Edition)
9th Edition
ISBN:9780134746241
Author:Edward J. Tarbuck, Frederick K. Lutgens, Dennis G. Tasa
Publisher:Edward J. Tarbuck, Frederick K. Lutgens, Dennis G. Tasa
Chapter1: The Study Of Minerals
Section: Chapter Questions
Problem 1LR
Related questions
Question
Answer #7 please

Transcribed Image Text:of the divergent plate boundary between the North
American Plate and the African and Eurasian Plates.
Refer to lecture slides if you need a reminder on which
plate is which.
2) Draw two blue lines on the map to show the location
of two transform fault plate boundaries.
3) Notice that points B and C were together 145 million
years ago, but did the sea floor spread apart at exactly
the same rate on both sides of the mid-ocean ridge?
How can you tell?
4) How far apart are points B and C today in kilometers?
5) Calculate the average rate in kilometers per million
years that points B and C have moved apart over the
past 145 million years (be sure to show your work!)
6) Convert your answer above from kilometers per
million years to millimeters per year:
7) A 20 year old college student wants to know how far
Africa and North America have moved apart during
their lifetime. Based on your answers above, make the
calculation for how far have Africa and North
America moved apart during the last 20 years: (or feel
free to do the calculation for your actual age)
1

Transcribed Image Text:Part 3: Age of the Seafloor
The map below shows the ages of seafloor basalt (the age
of the igneous rock that actually makes up the crust –
which is below the seafloor sediment that has accumulated
on top of it over time) between North America and Africa.
0-
Holocene &
Pliocene
-5.3
Spain
Miocene,
Oligocene,
Eocene, &
Paleocene
North
America
-65-
•B
Late
Cretaceous
-100
Lower
Cretaceous
145
Africa
Jurassic
Kilometers
2000
South
America
500
1000
1500
1) Draw a red line on the map to show the exact location
of the divergent plate boundary between the North
American Plate and the African and Eurasian Plates.
Refer to lecture slides if you need a reminder on which
plate is which.
2) Draw two blue lines on the map to show the location
of two transform fault plate boundaries.
3) Notice that points B and C were together 145 million
years ago, but did the sea floor spread apart at exactly
the same rate on both sides of the mid-ocean ridge?
How can you tell?
4) How far apart are points B and C today in kilometers?
5) Calculate the average rate in kilometers per million
years that points B and C have moved apart over the
past 145 million years (be sure to show your work!)
6) Convert your answer above from kilometers per
million years to millimeters per year:
Seafloor Ages in Millions of Years Ago (Ma)
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