What happens to oceanic crust at a deep ocean trench?
What happens to oceanic crust at a deep-ocean trench? At a deep-ocean trench, the oceanic crust bends downward. In a process taking tens of millions of years, part of the ocean floor sinks back into the mantle at deep-ocean trenches.
What causes magnetic stripes on the seafloor such as shown here?
At the mid-ocean ridge spreading axis, these flips in the direction of the Earth's magnetic field are recorded in the magnetization of the lava. This creates a symmetrical pattern of magnetic stripes of opposite polarity on either side of mid-ocean ridges.
Why does the elevation of the seafloor decrease from the mid-ocean ridge to the abyssal plain quizlet?
Why does the elevation of the seafloor decrease from the mid-ocean ridge to the abyssal plain? The oceanic lithosphere cools and becomes denser.
What creates magnetic stripes on the seafloor quizlet?
The rock of the ocean floor contains iron. As molten material cooled and hardenend, the iron bits inside lined up in the direction of Earth's magnetic poles, creating a pattern of magnetized stripes.
Which type of zone is located at a deep ocean trench?
Deep-sea trenches generally lie seaward of and parallel to adjacent island arcs or mountain ranges of the continental margins. They are closely associated with and found in subduction zones—that is, locations where a lithospheric plate bearing oceanic crust slides down into the upper mantle under the force of gravity.
What are the features of seafloor?
There are nine main features of the ocean floor which include (1) continental shelf, (2) continental slope, (3) continental rise, (4) abyssal plains, (5) abyssal hill, (6) mid-ocean ridges, (7) seamounts, (8) deep ocean trenches, and (9) volcanic islands.
How does oceanic crust move along mid-ocean ridges?
Mid-ocean ridges and seafloor spreading can also influence sea levels. As oceanic crust moves away from the shallow mid-ocean ridges, it cools and sinks as it becomes more dense. This increases the volume of the ocean basin and decreases the sea level.
When the sea floor spreads apart volcanoes and ridges are formed because?
Mid-ocean ridges occur along divergent plate boundaries, where new ocean floor is created as the Earth's tectonic plates spread apart. As the plates separate, molten rock rises to the seafloor, producing enormous volcanic eruptions of basalt.
Why does the seafloor decrease in elevation with distance from the mid-ocean ridge quizlet?
Why does the elevation of the seafloor decrease from the mid-ocean ridge to the abyssal plain? The oceanic lithosphere cools and becomes denser.
Why does the elevation of the seafloor decrease away from mid-ocean ridges?
Mid-ocean ridges and seafloor spreading can also influence sea levels. As oceanic crust moves away from the shallow mid-ocean ridges, it cools and sinks as it becomes more dense. This increases the volume of the ocean basin and decreases the sea level.
How are the magnetic stripes on the oceanic crust formed what is the significance of these stripes in understanding the Earth’s processes?
Since the oceanic crust contains iron in it, the way the rocks on the ocean floor hardened on both sides of the mid-ocean ridges are influenced by the direction of the magnetic field. As a result, it forms a pattern that resembles stripes that are alternately pointed north and south.
What are three features of the ocean floor?
Underwater landforms
- Continental shelf. Starting from land, a trip across an ocean basin along the seafloor would begin with crossing the continental shelf. …
- Abyssal plains. Continuing your journey across the ocean basin, you would descend the steep continental slope to the abyssal plain. …
- Mid-ocean ridge. …
- Ocean trenches.
May 1, 2020
Which type of zone is located at a deep ocean trench quizlet?
Located along convergent plate boundaries, these are active subduction zones. Deep sea trenches are the major topographic expression of convergent plate boundaries, surrounding most of the Pacific Rim.
Where are deep ocean trenches formed?
Trenches are found on the floor of the sea; however, their common name is deep ocean trenches because they are more often found in the deepest areas of the ocean. Trenches are formed in subduction zones where tectonic plates collide. There are many known trenches that scientists continue to study.
What are the deepest features of the ocean floor?
Ocean trenches The Mariana Trench, for example, is the deepest place in the ocean at 36,201 feet. Finally, you would ascend tens of thousands of feet back up the continental slope and across the continental shelf. Your journey across an ocean basin would end on the shore of another continent.
Which feature of the ocean floor includes its deepest parts?
-sea trenches Deep-sea trenches are the deepest parts of the ocean. The deepest one, the Marianas Trench in the South Pacific Ocean, is more than 35,000 feet (10,668 meters), or almost 6.6 miles (10.6 kilometers) deep.
Which of the following is associated with oceanic ridges?
Chapters 9-16
| Question | Answer |
|---|---|
| Which of the following is associated with ocean ridges? | all of these |
| An isolated remnant of wave erosion is a ________. | sea stack |
| Which one of the following would you NOT associate with turbidity currents? | formation of seamounts |
| Which of the following is a tidal current? | both flood and ebb tide |
Which statement describes one event that happened at deep ocean trenches?
Which statement describes one event that happens at deep-ocean trenches? Denser plates slide under lighter plates.
Which of the following geologic features can be observed in a place where two oceanic crusts diverge?
Divergent zones in oceanic plates form a geological feature called a ridge, forced upward by the pressure of the rising magma. The Mid-Atlantic Ridge is an example of an oceanic divergent boundary formation.
Which plate boundary and movement commonly create non volcanic mountains explain how non volcanic mountains are created by plate tectonics?
Answer and Explanation: The convergent boundary is one where the impact of the two plates towards one another results in the formation of non-volcanic mountains.
Why is the seafloor elevation of the abyssal plain lower than that of the mid-ocean ridge?
Why does the elevation of the seafloor decrease from the mid-ocean ridge to the abyssal plain? The oceanic lithosphere cools and becomes denser.
What happens to the crust behind a Migrating island arc as it moves along with a subducting slab?
What happens to the crust behind a migrating island arc as it moves along with a subducting slab? A back-arc basin forms. A spreading center develops. The crust thins and a rift forms.
What are the features of seafloor in seafloor spreading?
Midocean ridges, transform faults and fracture zones are the key surface features produced by seafloor spreading. In detail, midocean ridges are made up of short offset segments. The curved linear features running perpendicular to midocean ridges are fracture zones and transform faults.
What do magnetic stripes in the ocean crust represent?
When the Earth's magnetic field reverses, a new stripe, with the new polarity, begins. Such magnetic patterns led to recognition of the occurrence of sea-floor spreading, and they remain some of the strongest evidence for the theory of plate tectonics.
Which type of boundaries movement causing the formation of oceanic ridges?
When two plates are moving away from each other, we call this a divergent plate boundary. Along these boundaries, magma rises from deep within the Earth and erupts to form new crust on the lithosphere. Most divergent plate boundaries are underwater and form submarine mountain ranges called oceanic spreading ridges.
What are the features of oceanic floor?
There are nine main features of the ocean floor which include (1) continental shelf, (2) continental slope, (3) continental rise, (4) abyssal plains, (5) abyssal hill, (6) mid-ocean ridges, (7) seamounts, (8) deep ocean trenches, and (9) volcanic islands.
What occurs at an ocean trench?
Trenches are formed by subduction, a geophysical process in which two or more of Earth's tectonic plates converge and the older, denser plate is pushed beneath the lighter plate and deep into the mantle, causing the seafloor and outermost crust (the lithosphere) to bend and form a steep, V-shaped depression.
Where are deep-sea trenches found quizlet?
What are deep-ocean trenches? Long, narrow creases in the seafloor representing the deepest parts of the ocean floor. Most are located along the margins of the Pacific Ocean, with only two being located in the Atlantic.
What types of plate boundaries are associated with deep ocean trenches?
In particular, ocean trenches are a feature of convergent plate boundaries, where two or more tectonic plates meet. At many convergent plate boundaries, dense lithosphere melts or slides beneath less-dense lithosphere in a process called subduction, creating a trench.
What are the ocean features?
The sonar showed that the ocean floor has dramatic physical features, including huge mountains, deep canyons, steep cliffs, and wide plains. The ocean's crust is a thin layer of volcanic rock called basalt. The ocean floor is divided into several different areas.