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. The third, “failed rift” or aulacogen, may become a rift valley.
What is a rift valley example?
The Thingvellir fracture zone at Thingvellir National Park in southwestern Iceland is an example of a rift valley. Other notable examples include the Baikal Rift Valley (Russia) and the Rhine Rift Valley (Germany).
What is a rift valley kid definition?
tectonic activity creates rift valleys Rift valleys are not caused by erosion but are created by tectonic activity. The valleys form when continental crust is pulling apart allowing the land to drop down between parallel faults. These valleys also form when oceanic plates are moving apart forming a divergent boundary.
What is a rift valley called?
Rift valleys are sometimes called grabens, which means “ditch” in German. While there is no official distinction between a graben and a rift valley, a graben usually describes a small rift valley.
What is the rift valley and why is it important?
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.
Where is the rift valley?
The Rift Valley, located in Eastern Africa, covers just over 2% of the continent and spreads over seven countries (Map 5 and Table 29). min. max. The Rift Valley consists of a group of independent interior basins, extending from Djibouti in the north to Tanzania in the south, nearly half being located in Ethiopia.
Is a rift valley a landform?
Tectonic basins and rift valleys, landforms characterized by relatively steep, mountainous sides and flat floors. The steep sides are created by displacement on faults such that the valley floor moves down relative to the surrounding margins, or, conversely, the margins move up relative to the floor.
What is a rift valley easy definition?
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.
What is Great Rift Valley explain?
Africa’s Great Rift Valley is a 6,000-mile crack (fissure) in the earth’s crust, stretching from Lebanon to Mozambique. These forces caused huge chunks of the crust to sink between parallel fault lines and force up molten rock in volcanic eruptions.
What are 3 facts about the Great Rift Valley?
It contains the Rift Valley lakes, which include some of the deepest lakes in the world (up to 1,470 metres deep at Lake Tanganyika). These are the largest, in order of size from largest to smallest:
- Lake Victoria.
- Lake Tanganyika.
- Lake Malawi (Lake Nyasa)
- Lake Turkana (Lake Rudolf)
- Lake Albert.
How is a rift valley formed give one example of a rift valley?
A rift valley is formed by the submergence of a big landmass between two high block mountains, e.g. the Rhine river flows through a rift valley in its middle course.
Is a rift valley convergent or divergent?
Areas where plates are colliding form convergent boundaries, and areas where plates are expanding create divergent boundaries. Rift valleys are formed by divergent boundaries that involve continental plates.
What is rifting in geography?
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 Makes the Great Rift Valley such a geographical wonder?
This impressive gorge is between 30 and 100 kilometres wide and features the deepest lakes and highest mountains. The lakes and the geysers and hot springs in the volcanic landscape make this a truly unique setting – a natural wonder, with a unique combination of lakes, swamps, grassy plains, forests and animals.
How are rift valleys and block mountains formed?
Block mountains and rift valleys are associated landform as they are formed by the divergent plate boundaries due to the tensional forces which act on its boundary.
How Rift Valley was formed?
Rifts are formed as a result of the pulling apart of the lithosphere due to extensional tectonics. The linear depression may subsequently be further deepened by the forces of erosion. More generally the valley is likely to be filled with sedimentary deposits derived from the rift flanks and the surrounding areas.