Questions and Answers
What are ocean trenches?
Ocean trenches are deep sections of the ocean where an oceanic plate is usually sinking below a continental plate.
Which of the following are examples of ocean trenches? (Select all that apply)
How are ocean trenches formed?
They are formed in the subduction zone as the denser oceanic plate is subjected under the continental plate.
When was the Mariana Trench formed?
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How long is the Mariana Trench?
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How wide is the Mariana Trench?
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How deep is the Mariana Trench?
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Study Notes
Ocean Trenches
- Ocean trenches are significant geological features where an oceanic plate sinks beneath a continental plate, creating deep underwater valleys.
- The process of ocean trench formation occurs in subduction zones, where the denser oceanic plate is forced downwards.
Examples of Ocean Trenches
- Notable ocean trenches include:
- Mariana Trench
- Tonga Trench
- Philippine Trench
Formation of Ocean Trenches
- Ocean trenches are primarily formed through the subduction process, contributing to the dynamic nature of Earth's tectonic plates.
Mariana Trench Details
- The Mariana Trench was formed approximately 180 million years ago, making it one of the oldest trenches on the planet.
- It extends 2,550 km in length, stretching past the island of Guam.
- The trench has an average width of 69 km, showcasing its vast expanse underwater.
- The maximum known depth of the Mariana Trench is 10,994 meters, although it was previously recorded at 11,030 meters.
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Description
Explore the fascinating world of ocean trenches with these flashcards. Learn about what ocean trenches are, discover examples like the Mariana Trench, and understand the processes behind their formation. Perfect for oceanography students and enthusiasts!
