GEL 50 SQ21, Homework 2 Name: Lizeth Ayala
Ch 2: Plate Tectonics
Please enter your responses in the text boxes provided. All answers should be given in complete
sentences. Responses should be 1-3 sentences. Upload this completed document to CANVAS by the
posted deadline.
Grading: Each homework assignment is worth 25 pts. One question (chosen at random) from each
assignment will be graded for content. This question is worth 5 pts. The other 20 pts are earned
based on completeness: 100% (20 pts), 75% (15 pts), 50% (10 pts), 25% (5 pts), less than 25% (0
pts). Solutions will be posted online after the submission deadline so you can check your own
answers. Scores for late assignments will automatically be reduced by 25% for the Sirst 24 hours,
50% for the second 24 hours. No assignments accepted more than 48 hours after submission
deadline.
Chapter 2
1. Using the global isochron map (7igure 2.15), estimate how long ago the continents of
Australia and Antarctica were separated by sea7loor spreading. Did this happen before
or after South America separated from Africa?
I believe that the continents of Australia and Antartica were separated by seafloor
spreading about approximately 50-60 million years ago. This separation must have
happened after South America separated from Africa given that inner colors, in this
case blue, are older and these are the parts that must have been connected to one
another. Since blue is older than the green color we find connecting Australia and
Antartica, it can be predicted that these two continents split after south america
and Africa did.
2. Most active volcanoes are located near plate boundaries. Give an example of a volcano
that is not on a plate boundary and describe a hypothesis consistent with plate
tectonics that can explain its presence there.
Generally speaking volcanoes that are not associated with plate boundaries are
called Hotspot Volcanoes. Said volcanoes are located within tectonic plates and
create volcanoes when a plate moves over them. Some examples are located
throughout the islands of Hawaii.
©2021 Stewart & GEL50 Instructors: This content is protected and may not be shared, uploaded, or
distributed.
Ch 2: Plate Tectonics
Please enter your responses in the text boxes provided. All answers should be given in complete
sentences. Responses should be 1-3 sentences. Upload this completed document to CANVAS by the
posted deadline.
Grading: Each homework assignment is worth 25 pts. One question (chosen at random) from each
assignment will be graded for content. This question is worth 5 pts. The other 20 pts are earned
based on completeness: 100% (20 pts), 75% (15 pts), 50% (10 pts), 25% (5 pts), less than 25% (0
pts). Solutions will be posted online after the submission deadline so you can check your own
answers. Scores for late assignments will automatically be reduced by 25% for the Sirst 24 hours,
50% for the second 24 hours. No assignments accepted more than 48 hours after submission
deadline.
Chapter 2
1. Using the global isochron map (7igure 2.15), estimate how long ago the continents of
Australia and Antarctica were separated by sea7loor spreading. Did this happen before
or after South America separated from Africa?
I believe that the continents of Australia and Antartica were separated by seafloor
spreading about approximately 50-60 million years ago. This separation must have
happened after South America separated from Africa given that inner colors, in this
case blue, are older and these are the parts that must have been connected to one
another. Since blue is older than the green color we find connecting Australia and
Antartica, it can be predicted that these two continents split after south america
and Africa did.
2. Most active volcanoes are located near plate boundaries. Give an example of a volcano
that is not on a plate boundary and describe a hypothesis consistent with plate
tectonics that can explain its presence there.
Generally speaking volcanoes that are not associated with plate boundaries are
called Hotspot Volcanoes. Said volcanoes are located within tectonic plates and
create volcanoes when a plate moves over them. Some examples are located
throughout the islands of Hawaii.
©2021 Stewart & GEL50 Instructors: This content is protected and may not be shared, uploaded, or
distributed.
