EARTH SCIENCE
TECTONICS
|
Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
|
|
|
New seafloor is constantly being generated at the mid-ocean ridge, while older seafloor is recycled at deep-ocean trenches.
|
|
|
New seafloor is constantly being generated at deep-ocean trenches and older seafloor is being recycle at the mid-ocean ridge.
|
|
|
The Modern continents were once part of a supercontinent called Pangaea
|
|
|
The continents are being consumed at deep ocean trenches.
|
Detailed explanation-1: -The theory of seafloor spreading explains that molten material moves in at the boundaries between tectonic plates pushing them apart as new oceanic crust is created. This process is called seafloor spreadingand it occurs at divergent boundaries.
Detailed explanation-2: -sea-floor spreading-a hypothesis, proposed in the early 1960s, that new ocean floor is created where two plates move away from one another at mid-ocean ridges. subduction zone-a long, narrow zone where one lithospheric plate descends beneath another.
Detailed explanation-3: -The separated margins of the continents evolve to form passive margins. Hess’ theory was that new seafloor is formed when magma is forced upward toward the surface at a mid-ocean ridge.