How is the Divergent Boundary related
to the Plate Tectonics Theory ?
You will find the answer at this web site:
http://www.pbs.org/wgbh/aso/tryit/tectonics/indext.html
Look for the section on Divergent Boundaries
Divergent boundaries are regions where tectonic plates are moving apart.
The Divergent Boundary is closely related to the Plate Tectonics Theory. The Plate Tectonics Theory explains the movement and interaction of large pieces of the Earth's lithosphere, called tectonic plates. These plates float on top of the semi-fluid asthenosphere below.
At Divergent Boundaries, tectonic plates move away from each other due to the upwelling of hot magma from the mantle. This process is known as seafloor spreading. The upwelling magma creates new oceanic crust, which pushes the existing crust apart. As the crust spreads, it forms a gap where new lithosphere is continuously generated.
This type of boundary is usually found in the middle of the oceanic ridge system, such as the Mid-Atlantic Ridge. Here, new oceanic crust is formed as the plates move away from each other. The boundary can also occur within continents and form rift valleys, like the East African Rift System.
The Divergent Boundary is significant to the Plate Tectonics Theory as it provides evidence of the movement of tectonic plates. It helps explain the process of seafloor spreading and the creation of new crust, contributing to the overall understanding of how the Earth's lithosphere is constantly changing.