What feature of the ocean floor forms in the zones where the ocean floor and continents meet?
At the edge of the shelf, the ocean floor drops off in a steep incline called the continental slope (A). The continental slope marks the true edge of the continent, where the rock that makes up the continent stops and the rock of the ocean floor begins.
What feature of the ocean floor forms at the sides?
The process is called sea-floor spreading. Ridges form along cracks (divergent boundaries) in the oceanic crust (Molten rock (magma) rises through these cracks and pushes to both sides.
What are some characteristics of the ocean and the ocean floor?
Features of the ocean include the continental shelf, slope, and rise. The ocean floor is called the abyssal plain. Below the ocean floor, there are a few small deeper areas called ocean trenches. Features rising up from the ocean floor include seamounts, volcanic islands and the mid-oceanic ridges and rises.
What ocean floor features is associated with areas where oceanic crust is broken down?
Which of the following ocean-floor features is associated with areas where oceanic crust is broken down? Abyssal plain.
What are 4 types of 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.
What are the evidence of seafloor spreading?
The study of the repeated reversal of the Earth’s magnetic poles over time has provided convincing evidence of seafloor spreading. Objective: To explore how magnetic studies and age information provide evidence for seafloor spreading that explains why oceanic crust is younger than continental crust.
What are 3 pieces of evidence to support that seafloor spreading is happening?
Look at Figure 19 to see the process of sea-floor spreading. Several types of evidence from the oceans supported Hess’s theory of sea-floor spreading-evidence from molten material, magnetic stripes, and drilling samples.
What are the 2 supporting evidence of seafloor spreading?
Abundant evidence supports the major contentions of the seafloor-spreading theory. First, samples of the deep ocean floor show that basaltic oceanic crust and overlying sediment become progressively younger as the mid-ocean ridge is approached, and the sediment cover is thinner near the ridge.
What are the three types of seafloor spreading?
There are three types of plate-plate interactions based upon relative motion: convergent, where plates collide, divergent, where plates separate, and transform motion, where plates simply slide past each other.
What is the cause of seafloor spreading?
Seafloor spreading occurs at divergent plate boundaries. As tectonic plates slowly move away from each other, heat from the mantle’s convection currents makes the crust more plastic and less dense. The less-dense material rises, often forming a mountain or elevated area of the seafloor.
What is the importance of seafloor spreading?
Significance. Seafloor spreading helps explain continental drift in the theory of plate tectonics. When oceanic plates diverge, tensional stress causes fractures to occur in the lithosphere.
What drives the plates to move around?
The heat from radioactive processes within the planet’s interior causes the plates to move, sometimes toward and sometimes away from each other. This movement is called plate motion, or tectonic shift.
What are the 3 causes of plate movement?
In this lesson, we explore the causes of plate movement, including thermal convection, ridge push and slab pull.
What is the force that moves the continents?
The movement of these tectonic plates is likely caused by convection currents in the molten rock in Earth’s mantle below the crust. Earthquakes and volcanoes are the short-term results of this tectonic movement. The long-term result of plate tectonics is the movement of entire continents over millions of years (Fig.
How do ridge push and slab pull work together?
“ridge push” The lithosphere thickens with distance (and time) away from the midocean ridge. “slab pull” As lithospheric plates move away from midocean ridges they cool and become denser. They eventually become more dense than the underlying hot mantle.
What are the similarities and differences between ridge push and slab pull?
‘Ridge Push’ and ‘Slab Pull’ are thought to be the major forces driving the motion of oceanic plates. Ridge push is caused by the potential energy gradient from the high topography of the ridges. Slab pull is caused by the negative buoyancy of the subducting plate.
What is the difference between a ridge push and slab pull?
Slab Pull: The force exerted by the weight of the subducted slab on the plate it is attached to. Ridge Push: The pressure exerted by the excess height of the mid-ocean ridge.
What are the effects of ridge push?
Ridge push (also known as gravitational sliding) or sliding plate force is a proposed driving force for plate motion in plate tectonics that occurs at mid-ocean ridges as the result of the rigid lithosphere sliding down the hot, raised asthenosphere below mid-ocean ridges.
What natural process is responsible for Ridge push?
Seafloor spreading
What happens during slab pull?
Slab pull is that part of the motion of a tectonic plate caused by its subduction. In 1975 Forsyth and Uyeda used the inverse theory method to show that, of the many forces likely to be driving plate motion, slab pull was the strongest.
What is the result of the ridge push motion at the divergent boundary?
As the lithosphere formed at divergent plate margins is hot, and less dense than the surrounding area it rises to form oceanic ridges. The newly-formed plates slide sideways off these high areas, pushing the plate in front of them resulting in a ridge-push mechanism.
What are the four driving forces behind plate motion?
The forces that drive Plate Tectonics include: Convection in the Mantle (heat driven) Ridge push (gravitational force at the spreading ridges) Slab pull (gravitational force in subduction zones)
What does ridge push create?
Ridge Push. Ridge Push. Gravitational force that causes a plate to move away from the crest of an ocean ridge, and into a subduction zone. It works together with Slab Pull, but is much less significant.
Where is Earth’s heat energy most concentrated?
Where Do We Find Geothermal Energy? Although heat from the center of the Earth is migrating to the surface everywhere, the heat is concentrated at the edges of tectonic plates.
Where is Earth’s heat energy most concentrated quizlet?
Where is Earth’s heat energy most concentrated? Which of the following best describes the location of the mantle? Between the crust and the core.
Where is Earth’s heat energy most concentrated the mantle the lithosphere the core the crust?
Asthenosphere, zone of Earth’s mantle lying beneath the lithosphere and believed to be much hotter and more fluid than the lithosphere. The asthenosphere extends from about 100 km (60 miles) to about 700 km (450 miles) below Earth’s surface.
What is the main cause of most earthquakes?
Earthquakes are usually caused when rock underground suddenly breaks along a fault. This sudden release of energy causes the seismic waves that make the ground shake. The rocks are still pushing against each other, but not moving. After a while, the rocks break because of all the pressure that’s built up.
Where in general do most earthquakes occur?
Where do earthquakes occur?
- The world’s greatest earthquake belt, the circum-Pacific seismic belt, is found along the rim of the Pacific Ocean, where about 81 percent of our planet’s largest earthquakes occur.
- The Alpide earthquake belt extends from Java to Sumatra through the Himalayas, the Mediterranean, and out into the Atlantic.
Which city is most likely to experience a strong earthquake *?
The following are the cities which experts believe are the most likely to experience a major earthquake.
- Tokyo, Japan.
- Jakarta, Indonesia.
- Manila, Philippines.
- Los Angeles, California.
- Quito, Ecuador.
- Osaka, Japan.
- San Francisco, California.
- Lima, Peru.
What’s the main cause of most earthquakes quizlet?
What’s the main cause of most earthquakes? tectonic plates?