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 feature is created at mid-ocean ridges?
They form a rift valley system that encircles the Earth along a total length of over 75,000 km (Figure 6.11). The mid-ocean ridges are the earth's largest volcanic system, accounting for >75% of all volcanic activity on the planet. The heat from this volcanism is dispersed by hydrothermal circulation of seawater.
What is an example of mid-ocean ridge?
In the Atlantic Ocean, the mid-ocean ridge is called the Mid-Atlantic Ridge. It curves from the Arctic Ocean southward, through Iceland, down the center of the Atlantic, and around the bottom of Africa.
Which of the following is not associated with mid-ocean ridges?
(a)Mid-ocean ridge is not associated with a convergent plate boundary. Explanation: Mid-ocean ridges form near divergent plate boundaries where the new ocean bottom is formed when tectonic plates separate. The Molten rock rises to the seafloor as the plates separate resulting in massive basalt volcanic eruptions.
What plate boundaries are associated with ocean trench?
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 characteristics of ocean ridge?
Principal characteristics. Oceanic ridges are found in every ocean basin and appear to girdle Earth. The ridges rise from depths near 5 km (3 miles) to an essentially uniform depth of about 2.6 km (1.6 miles) and are roughly symmetrical in cross section. They can be thousands of kilometres wide.
Which feature of Earth is created at mid-ocean ridges quizlet?
Seafloor spreading is a process that occurs at mid-ocean ridges, where new oceanic crust is formed through volcanic activity and then gradually moves away from the ridge. Seafloor spreading helps explain continental drift in the theory of plate tectonics.
What type of rocks are found at the mid-ocean ridge?
Igneous rock is formed by the cooling and crystallization of molten magma at volcanoes and mid-ocean ridges, where new crust is generated. Examples of igneous rock are basalt, granite, and andesite (Fig. 7.57 A).
What is a mid-ocean ridge landform?
A mid-ocean ridge (MOR) is a seafloor mountain system formed by plate tectonics. It typically has a depth of about 2,600 meters (8,500 ft) and rises about 2,000 meters (6,600 ft) above the deepest portion of an ocean basin. This feature is where seafloor spreading takes place along a divergent plate boundary.
What are oceanic trenches associated with?
Ocean trenches are a result of tectonic activity, which describes the movement of the Earth's lithosphere. In particular, ocean trenches are a feature of convergent plate boundaries, where two or more tectonic plates meet.
What type of plate boundary is the Mid Atlantic Ridge?
The Mid-Atlantic Ridge is a mid-ocean ridge (a divergent or constructive plate boundary) located along the floor of the Atlantic Ocean, and part of the longest mountain range in the world.
What are mid-ocean ridges quizlet?
mid-ocean ridge. an undersea mountain chain where new ocean floor is produced at a divergent plate boundary.
Which geologic feature is most likely to form at a mid-ocean ridge?
The vast majority of volcanic activity on the planet occurs along the mid-ocean ridge, and it is the place where the crust of the Earth is born. The material that erupts at spreading centers along the mid-ocean ridge is primarily basalt, the most common rock on Earth.
What minerals are found in the oceanic crust?
Oceanic crust is composed of basalt, the result of partial melting of the mantle. It is rich in Mg, Fe, Ca, Al which are in the minerals olivine, pyroxene plagioclase feldspar.
What is the oceanic crust made of?
Oceanic Crust Oceanic crust, extending 5-10 kilometers (3-6 kilometers) beneath the ocean floor, is mostly composed of different types of basalts. Geologists often refer to the rocks of the oceanic crust as “sima.” Sima stands for silicate and magnesium, the most abundant minerals in oceanic crust.
What type of tectonic plate boundary created the Mid-Atlantic Ridge?
divergent plate boundaries The Mid-Atlantic Ridge is an example of divergent plate boundaries. When two plates come together, it is known as a convergent boundary. The impact of the colliding plates can cause the edges of one or both plates to buckle up into a mountain ranges or one of the plates may bend down into a deep seafloor trench.
How do mountains form on mid-ocean ridge?
Plate tectonics refers to the interlocking system of parts of the Earth's crust which move atop a layer of molten magma, much like islands on a body of water. The mountains associated with the mid-ocean ridge are formed as tectonic plates move apart at locations known as divergent plate boundaries.
What type of plate boundary is associated with deep ocean trenches?
convergent plate boundaries 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.
Does seafloor spreading cause mid-ocean ridges?
This rock (basalt) becomes a new part of Earth's crust. Mid-Ocean Ridges Seafloor spreading occurs along mid-ocean ridges—large mountain ranges rising from the ocean floor.
How are Mid-Atlantic ridges formed?
The ridge is thought to have been formed in the Triassic period, due to the divergent motion of Eurasian, North American, South American and African tectonic plates, which caused the formation of a three-armed valley in Pangea, the ancient supercontinent.
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 causes mid-ocean ridges quizlet?
Two oceanic plates collide at a convergent boundary. The older, denser oceanic crust subducts into the mantle. Why is the Atlantic Ocean getting bigger? The ocean floor of the majority of the Atlantic Ocean forms at a divergent boundary along a mid-ocean ridge resulting in sea floor spreading.
How oceanic ridges are formed?
If the tectonic plates move away from each other, magma from the asthenosphere can push up through the gap causing an underwater volcano. The magma cools and solidifies, creating new layers of ocean crust that continues to build, forming the oceanic ridges.
What type of rock makes up the oceanic crust?
basalts Oceanic Crust Oceanic crust, extending 5-10 kilometers (3-6 kilometers) beneath the ocean floor, is mostly composed of different types of basalts. Geologists often refer to the rocks of the oceanic crust as “sima.” Sima stands for silicate and magnesium, the most abundant minerals in oceanic crust.
What are found at the oceanic crust answer?
Oceanic crust is about 6 km (4 miles) thick. It is composed of several layers, not including the overlying sediment. The topmost layer, about 500 metres (1,650 feet) thick, includes lavas made of basalt (that is, rock material consisting largely of plagioclase (feldspar) and pyroxene).
What rocks form at mid-ocean ridges?
basalt Igneous rock is formed by the cooling and crystallization of molten magma at volcanoes and mid-ocean ridges, where new crust is generated. Examples of igneous rock are basalt, granite, and andesite (Fig. 7.57 A).
What are the main features of oceanic crust?
Oceanic crust differs from continental crust in several ways: it is thinner, denser, younger, and of different chemical composition. Like continental crust, however, oceanic crust is destroyed in subduction zones. The lavas are generally of two types: pillow lavas and sheet flows.
What type of boundary is the mid-ocean ridge?
divergent plate boundaries Mid-ocean ridges occur along divergent plate boundaries, where new ocean floor is created as the Earth's tectonic plates spread apart.
How does a mid-ocean ridge form?
It formed and evolves as a result of spreading in Earth's lithosphere—the crust and upper mantle—at the divergent boundaries between tectonic plates. The vast majority of volcanic activity on the planet occurs along the mid-ocean ridge, and it is the place where the crust of the Earth is born.
How do mid-ocean ridges form quizlet?
A mid-ocean ridge or mid-oceanic ridge is an underwater mountain range, formed by plate tectonics. This uplifting of the ocean floor occurs when convection currents rise in the mantle beneath the oceanic crust and create magma where two tectonic plates meet at a divergent boundary.