Examine the image above which shows a plate boundary in the North Atlantic Ocean and the age of the oceanic crust in that area - Leaving Cert Geography - Question 3A - 2022
Question 3A
Examine the image above which shows a plate boundary in the North Atlantic Ocean and the age of the oceanic crust in that area. Answer each of the following question... show full transcript
Worked Solution & Example Answer:Examine the image above which shows a plate boundary in the North Atlantic Ocean and the age of the oceanic crust in that area - Leaving Cert Geography - Question 3A - 2022
Step 1
Name each of the tectonic plates labelled A and B.
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Answer
The tectonic plate labelled A is the North American Plate, and the plate labelled B is the Eurasian Plate.
Step 2
Name the country labelled C which is located along the Mid-Atlantic Ridge.
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The country labelled C is Iceland.
Step 3
State the age range for the oceanic crust at the locations labelled D and E.
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The age range for the oceanic crust at location D is 145 - 180 million years, while the age range at location E is 0 - 2.6 million years.
Step 4
What type of igneous rock is most commonly formed along mid-ocean ridges?
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The type of igneous rock most commonly formed along mid-ocean ridges is basalt.
Step 5
Explain briefly why the ocean crust found at E is older than the ocean crust found at D.
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The ocean crust at E is older than at D because it is formed further from the mid-ocean ridge where new crust is created. As tectonic plates shift, older crust is pushed away from the ridge, making it appear older compared to newer crust formed at the ridge.
Step 6
Explain briefly what is meant by the term Moho line.
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The Moho line, or Mohorovičić discontinuity, refers to the boundary that separates the Earth's crust from the underlying mantle. It marks a transition from less dense, solid rock of the crust to the denser material of the mantle beneath.
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