Why are mid-ocean ridges elevated quizlet?
The Mid-Oceanic Ridge is elevated above surrounding seafloor because it is made of hotter and less dense lithosphere than oceanic crust farther away from the divergent boundary.
What is the function of the oceanic ridge quizlet?
Mid-ocean ridges are spreading centers, they are divergent plate boundaries where magma wells up from below, creating new oceanic crust.
Why does the lithosphere thicken as it moves away from the ridge as a result of seafloor spreading quizlet?
Why does the lithosphere thicken as it moves away from the ridge as a result of seafloor spreading? Because it is cooled from above as seawater circulates through the pore spaces and fractures in the rock.
Why is the southern tip of Africa elevated quizlet?
Why is the southern tip of Africa elevated? Why is the Hudson Bay region slowly uplifting? The region is experiencing isostatic uplift after being covered by thick glaciers.
Why are ocean ridges elevated?
Since hot rocks are in a more expanded state and then contract as they cool (as they spread away from the ridge), the midocean ridges stand up high above the surrounding seafloor. The seafloor depth increases with distance away from the midocean ridges.
What explains the high elevations of mid-ocean ridges?
What explains the high elevations of mid-ocean ridges and the flanks of rift valleys? Because mid-ocean ridges lie at a higher elevation than the rest of the ocean floor gravity causes the ridge to push on the lithosphere that lies farther from the ridge.
What is an oceanic ridge quizlet?
an undersea mountain chain where new ocean floor is produced at a divergent plate boundary. sonar.
What is the function of the oceanic ridge?
Mid-ocean ridges are the longest, largest and most voluminous magmatic environment on Earth. Ridges are the site of new lithospheric and crustal production that may be subsequently subducted into the mantle and recycled, or involved in magma-producing dehydration reactions that slowly build up continental crust (Fig.
What causes ocean lithosphere to move away from mid-ocean ridges?
Geophysical Heat Flow* Oceanic lithosphere forms at midocean ridges, where hot magma upwells, and then cools to form plates as the material moves away from the spreading center. As the plate cools, heat flow decreases and the seafloor deepens (Figure 3).
Why are oceanic ridges more elevated than the rest of the sea floor?
Why are oceanic ridges more elevated than the rest of the sea floor? Ridges are elevated because the rocks are hot.
Which is the southernmost Cape in Africa quizlet?
Cape Agulhas is the southernmost point in the continent of Africa.
What causes mountain formation in a continental rifting setting quizlet?
Multiple terrains accreted onto the continental crust. What causes mountain formation in a continental rifting setting? Lithospheric blocks, bounded by normal faults, tilt and rise.
Why mid-oceanic ridge is elevated compared to other parts of the seafloor?
Increased seafloor spreading means that the mid-ocean ridge will then expand and form a broader ridge with decreased average depth, taking up more space in the ocean basin. This displaces the overlying ocean and causes sea levels to rise.
What causes mid-ocean ridges?
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.
What explains the high elevations of mid-ocean ridges and the flanks of rift valleys?
What explains the high elevations of mid-ocean ridges and the flanks of rift valleys? Because mid-ocean ridges lie at a higher elevation than the rest of the ocean floor gravity causes the ridge to push on the lithosphere that lies farther from the ridge.
How does oceanic crust move along mid-ocean ridges quizlet?
How do mid-ocean ridges form? Underneath the ocean, deep in the earth convection currents bring molten material up to the upper mantle. This material rises through faults (cracks) between oceanic plates that are moving away from one another. This material fills the cracks, hardens, and forms new crust.
What causes a mid-ocean ridge?
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 are mid-ocean ridges elevated?
Since hot rocks are in a more expanded state and then contract as they cool (as they spread away from the ridge), the midocean ridges stand up high above the surrounding seafloor. The seafloor depth increases with distance away from the midocean ridges.
How ocean ridges are formed?
The mid-ocean ridge forms due to volcanic activity located along the Earth's tectonic plates. 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.
Which boundary movement causes the formation of oceanic ridge?
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 do ridges and rises have in common?
What do ridges and rises have in common? They are both associated with divergent plate boundaries.
What is the southwest corner of Africa marked by?
39 Cards in this Set
| The world's second largest lake is in the countries of Kenya, Uganda, and Tanzania, and is called Lake _______. | Victoria |
|---|---|
| The southwest corner of Africa is marked by the ___________. | Cape of Good Hope |
| The only African nation which is not independent is _________. | Western Sahara |
What country harbors Africa’s tallest peak Mount Kilimanjaro Tanzania Kenya Mozambique Nigeria?
Located in Tanzania, Mount Kilimanjaro is Africa's tallest mountain at about 5,895 meters (19,340 feet). It is the largest free-standing mountain rise in the world, meaning it is not part of a mountain range.
What type of plate boundary is associated with mountain building?
convergent boundary The process of mountain building involved with such chains involves a convergent boundary between two plates. One of the most dramatic ranges on the Earth is the Himalayan range.
Which of the following best describes the effect of convective flow on the elevation of Earth’s major landforms?
Which of the following best describes the effect of convective flow on the elevation of Earth's major landforms? Hot rising material upwarps the landscape whereas downward flow causes downwarping.
Why are mid-oceanic ridge rises the highest part of deep ocean basins?
What explains the high elevations of mid-ocean ridges and the flanks of rift valleys? Because mid-ocean ridges lie at a higher elevation than the rest of the ocean floor gravity causes the ridge to push on the lithosphere that lies farther from the ridge.
How ridges are formed?
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.
What happens to the crust as you move towards the mid-ocean ridge quizlet?
When new crust is formed along the mid-ocean ridge, the old rock/crust is pushed out way from the ridge. So, the further away you get from the ridge , the older the rock/crust gets.
How does oceanic crust move along mid-ocean ridge?
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 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.