7,713′

Near the equator, the Mid-Atlantic Ridge is divided into the North Atlantic Ridge and the South Atlantic Ridge by the Romanche Trench, a narrow submarine trench with a maximum depth of 7,758 m (25,453 ft), one of the deepest locations of the Atlantic Ocean.

The oceanic ridge system is a continuous underwater mountain range with parts found in every ocean of the world. The ridge system is created when magma rising between diverging plates of the lithosphere cools and forms a new layer of crust.

Aseismic ridge, a long, linear and mountainous structure that crosses the basin floor of some oceans. Most aseismic ridges are constructed by volcanism from a hot spot and are composed of coalescing volcanoes of various sizes.

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. This rock (basalt) becomes a new part of Earth’s crust.

Over the past 10,000 years, the Thingvellir Rift Valley has been changed in appearance by the spreading and sinking of the Earth’s crust and by earthquakes. Measurements suggest that the floor of the valley has widened 230 feet (70 m) and sunk by 131 feet (40 m) in the space of 10,000 years.

Great Rift Valley System

If the boundary is found between two continental plates you are left with a rift valley. If two oceanic plates begin moving away from each other it creates a mid-oceanic ridge. Continental plates are less dense, and thus float much higher on the mantle.

Faster spreading ridges like the northern and southern East Pacific Rise are “hotter,” meaning more magma is present beneath the ridge axis and more volcanic eruptions occur. Because the plate under the ridge crest is hotter scientists think that the plate responds to the divergent spreading process more fluidly.

Answer Expert Verified The gap or fissures on lands which are called rift valleys and oceanic ridges on the pictures are all product of divergence of plates.

The all four pictures show a water form or bodies of water. The cracks and fissure between two land masses in the picture continue to widen as time pass by since two land masses are going separate ways.