Is rift a geological feature?
In geology, a rift is a linear zone where the lithosphere is being pulled apart and is an example of extensional tectonics. Major rifts occur along the central axis of most mid-ocean ridges, where new oceanic crust and lithosphere is created along a divergent boundary between two tectonic plates.
What geologic processes are occurring in East Africa’s Great Rift Valley?
The East African rift system is marked by substantial volcanic activity, including lavas erupted from fissures along the rift in the region. Much of the faulting observed in this image cuts through such lavas. Elsewhere along the rift system, individual volcanoes form.
What geological phenomenon has created the rift valleys of East Africa what physical geographic features are found here?
Mountain ranges, volcanic peaks, and large lakes are found in or along the rift valleys of eastern Africa. The rift valleys were created by tectonic activity.
What landforms are found in the Great Rift Valley?
The summits of the volcanoes peppering the valley floor and the edging plateaus are impressive: The two highest mountains in Africa, 19,341-foot Kilimanjaro and 17,058-foot Mount Kenya, flank the eastern rift.
How rift valleys are formed?
A rift valley is a lowland region formed by the interaction of Earth’s tectonic plates. A rift valley is a lowland region that forms where Earth’s tectonic plates move apart, or rift. Rift valleys are found both on land and at the bottom of the ocean, where they are created by the process of seafloor spreading.
Why do continents rift?
Rifting can be caused when hot material from a mantle plume reaches the base of a continental plate and causes the overlying lithosphere to heat up. In addition to this the uwards movement of the plume against the base of the plate results in extensional forces, which can cause rifting.
What is the importance of rift valley?
The rift valleys are enormous fractures affecting the continental plates that widen progressively with time: they represent the first stages in the complex process of extension and rupture of continents and anticipate the development of new oceanic basins between them.
What is the cause for formation of Great East African Rift Valley?
Millions of years ago, the Arabian Peninsula was connected to Africa. Seafloor spreading caused the Arabian and African plates to rift apart. The Indian Ocean flooded the rift valley between the continents, creating the Red Sea. South of the Red Sea Rift lies the massive, complex East African Rift.
Why is the Great Rift Valley in Africa a good example of divergent convergence?
Great Rift Valley (The Best Example of a Divergent Boundary) In a southwest direction, the fault continues as the Great Rift Valley, which split the older Ethiopian highlands into two halves. In eastern Africa, the valley divides into the Eastern Rift and the Western Rift.
How a rift valley is formed?
What is a Rift Valley give an example?
Rift valleys are found both on the continents and on the floor of ocean basins. Other notable examples include the Baikal Rift Valley (Russia) and the Rhine Rift Valley (Germany).
Which is the main branch of the Rift Valley?
The system consists of two branches. The main branch, the Eastern Rift Valley (often called the Great Rift Valley, or Rift Valley), extends along the entire length of the system. In the north the rift is occupied by the Jordan River, the Dead Sea, and the Gulf of Aqaba.
Where are the rift valleys in East Africa?
East African Rift System. The main branch, the Eastern Rift Valley (often called the Great Rift Valley, or Rift Valley), extends along the entire length of the system. In the north the rift is occupied by the Jordan River, the Dead Sea, and the Gulf of Aqaba. It continues southward along the Red Sea and into the Ethiopian Denakil Plain…
What are the geometries of the rift basin?
Synrift strata commonly onlap prerift rocks. In a cross section oriented parallel to the boundary fault (longitudinal section), the basin has a synclinal geometry (Fig. 188.8.131.52c), although more complicated geometries are associated with segmented boundary fault systems (e.g., Schlische, 1993; Schlische and Anders, 1996; Morley, 1999).
Where are the lakes in the Rift Valley?
The western branch of the system, the Western Rift Valley, extends northward from the northern end of Lake Nyasa (Lake Malawi) in a great arc that includes Lakes Rukwa, Tanganyika, Kivu, Edward, and Albert. Most of the lakes in the rift system are deep and fjordlike, some with their floors well below sea level.