Jana Activity 2.3
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Central Piedmont Community College *
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101
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Geology
Date
Apr 3, 2024
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docx
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Examine the patterns shown in Figures 2.6 and 2.7 (on page 33 of your book) and answer the following questions to understand the initial reasoning underlying plate tectonics theory. (a) Where are the volcanic and earthquake patterns most similar? -
Volcanic and earthquake patterns are most similar along the ring of fire. (b) In what parts of the world are there abundant earthquakes but not (apparently) active volcanoes? -
In the Mindanao area of the Philippines, there are abundant earthquakes but not active volcanoes. (c) Focus on the patterns in the middle of the Atlantic Ocean. Only a few volcanoes are shown along the Mid-Atlantic Ridge, but earthquakes seem to occur all along it. Volcanic activity does, in fact, occur all along the ridge. Why are only a few volcanoes shown?
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There are only a few volcanoes shown because plate tectonics are being shifted.
When the volcanoes erupt along the ridge, this ultimately results in a push off of the ridge from their source of magma. (d) The dots on the figure below indicate the locations of earthquakes at depth within the Earth's interior, resulting from an interaction between two plates. ●
What is the region where these plates meet called? -
The region where these plates meet is called the asthenosphere. ●
What kind of plate boundary does this represent? -
This represents a transform plate boundary. 1.
The Mindanao area of the Philippines is vulnerable to earthquake, but not to volcanic eruption. In Mindanao there are no active volcanoes, but there is a lot of seismic activity. The Philippines is along the Ring of Fire in the Pacific. The oceanic Philippine plate and other smaller micro-plates are subducting along the Philippine Trench to the East, and the Luzon, Sulu and several other small Trenches to the West (Masum & Akbar, 2019). 2.
The reason why there are few volcanoes shown is because the plates here are moving apart new land being formed the it moves away similarly, when volcanoes erupt along the ridge, they are often pushed off the ridge from their source of magma, hence only few and most probably the new ones will be on the
ridge at a given time.
3.
According to jigsaw theory, continents like South American and Africa were once joined together at one point then were split apart due the opening-up of the Atlantic Ocean along the Mid-Atlantic Ridge (Spoelstra, et al, 2020). This explains the reason in similarities in the rocks and fossils on both continents.
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