What is the difference between continental drift seafloor spreading and plate tectonics?
Supporters of continental drift originally theorized that the continents moved (drifted) through unmoving oceans. Seafloor spreading proves that the ocean itself is a site of tectonic activity. Seafloor spreading is just one part of plate tectonics. Subduction is another.
Is continental drift related to plate tectonics?
Continental drift describes one of the earliest ways geologists thought continents moved over time. Today, the theory of continental drift has been replaced by the science of plate tectonics. The theory of continental drift is most associated with the scientist Alfred Wegener. … He called this movement continental drift.
How do plate tectonics affect continental drift?
The crust is broken up into giant tectonic plates that ride atop the magma, hot melted-rock material that makes up much of the interior of the Earth. Over millions of years, the continents drift into new configurations. Convection in the molten rock of Earth’s mantle drives the movement of the plates.
What is the major difference between continental drift and plate tectonics quizlet?
What are the differences between Continental Drift and Plate Tectonics? Continental drift believes that the continents moved because the magnetism of the sea floor. Plate tectonics believes that the lithosphere & the asthenosphere of the continents caused them to move.
What is the difference between continental drift and sea floor spreading quizlet?
Continental drift is a hypothesis that suggests that earth’s continents move over time. Seafloor spreading is a theory that states that new ocean crust forms along mid-ocean ridges.
How are plate tectonics and continental drift similar?
Plate tectonics is the theory that Earth’s land masses are in constant motion. The realization that Earth’s land masses move was first proposed by Alfred Wegener, which he called continental drift. … But the continents actually are shifting, very slowly, relative to one another.
What proves continental drift?
The evidence for continental drift included the fit of the continents; the distribution of ancient fossils, rocks, and mountain ranges; and the locations of ancient climatic zones.
How does continental drift and seafloor spreading support plate tectonics?
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. … Plates that are not subducting are driven by gravity sliding off the elevated mid-ocean ridges a process called ridge push.
What does the theory of plate tectonics state about the earth marine science?
Plate tectonics theory. theory that Earth’s outer shell is divided into several plates that glide over the mantle, the rocky inner layer above the core. Crust.
Which two continents drifted apart to form the Central Atlantic ocean?
The first oceans formed from the breakup, some 180 million years ago, were the central Atlantic Ocean between northwestern Africa and North America and the southwestern Indian Ocean between Africa and Antarctica. The South Atlantic Ocean opened about 140 million years ago as Africa separated from South America.
What aspect of the continental drift theory is opposed by the seafloor spreading theory explain how they differ?
Similar to Wegener’s theory that continents do in fact move, Hess’ seafloor spreading contradicted Wegener’s continental drift in that it involved the ocean sea floor moving as it expanded—instead of continents ploughing through the sea.
Why was Wegener’s idea of continental drift rejected?
The main reason that Wegener’s hypothesis was not accepted was because he suggested no mechanism for moving the continents. He thought the force of Earth’s spin was sufficient to cause continents to move, but geologists knew that rocks are too strong for this to be true.
What happens to the oceanic plate when it collides with a continental plate?
When an ocean plate collides with another ocean plate or with a plate carrying continents, one plate will bend and slide under the other. This process is called subduction. A deep ocean trench forms at this subduction boundary.
What does the theory of plate tectonics assume about plates?
Plate tectonic theory is based on several assumptions about tectonic processes: 1) that new material is generated by sea-floor spreading at the mid-ocean ridges, which once formed become part of a plate, 2) that surface area is conserved, therefore plate material must be destroyed through another process, and 3) motion …
How does plate tectonic theory explain the Ural mountains separating Europe and Asia?
The Ural Mountains run from north to south through Central Asia, separating Europe from Asia. … When the western Siberia plate smashed into the Baltica and North America plate, this action pushed up the land to make the Ural Mountains, and formed the supercontinent of Laurasia.
What is being formed continental collide another continental plate?
What happens when two continental plates collide? … Instead, a collision between two continental plates crunches and folds the rock at the boundary, lifting it up and leading to the formation of mountains and mountain ranges.
What happens when two plates slide or grind past each?
When oceanic or continental plates slide past each other in opposite directions, or move in the same direction but at different speeds, a transform fault boundary is formed. No new crust is created or subducted, and no volcanoes form, but earthquakes occur along the fault.
When an oceanic and a continental plate meet?
Subduction zones occur where an oceanic plate meets a continental plate and is pushed underneath it. Subduction zones are marked by oceanic trenches. The descending end of the oceanic plate melts and creates pressure in the mantle, causing volcanoes to form.
What happens in continental continental?
When two continental plates converge, they smash together and create mountains. The amazing Himalaya Mountains are the result of this type of convergent plate boundary. The Appalachian Mountains resulted from ancient convergence when Pangaea came together.
Why do continental collisions occur?
Once a continent is pulled into the Andean-type arc, the two continents collide because the arriving continent is too low a density to subduct. At the onset of subduction, the more dense plate descends beneath the less dense one. This is usually where a new continental rift forms, so the new pieces collide.
Why do two continental plates uplift converge?
Why do two continental plates uplift converge? As a continent converges on an ocean ridge, it over-rides an increasingly thin and hot subducting plate. As a consequence, the leading edge of the continent is uplifted and the uplift progresses inland during convergence. …
Which of the following is a feature of a continental continental convergent plate boundary?
Effects found at a convergent boundary between continental plates include: intense folding and faulting; a broad folded mountain range; shallow earthquake activity; shortening and thickening of the plates within the collision zone.