are the tops of some mid-ocean ridges split by a steep-sided valley
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Rift Valley
If the split is complete then it's just two continents with names of their own (the current condition of the world). If they're in the process of splinting, the split is called a rift valley (biggest ones today are in Africa).
Rift are formed between divergent boundaries, as the plates break apart from each other, a rift is formed between them. Also as they split apart the void between them forms a rift valley. Like the great rift valley in Africa.
200 years ago it split
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yes
The Great Rift Valley was split because of an earthquake.
The rift valley was formed when the continents divided it split open a large area in Africa and formed The Great Rift Valley.
Rift Valley
Divergent plate boundaries occur where two plates are moving away from each other, and "new ground" is being formed. The oceans all have divegent boundaries at the mid-oceanic ridges. Another one is in eastern Africa in what is known as the Great Rift Valley. This will someday split the African continent apart.
it will split into three pieces
If the split is complete then it's just two continents with names of their own (the current condition of the world). If they're in the process of splinting, the split is called a rift valley (biggest ones today are in Africa).
he proposed that mid-ocean ridges were areas where the floors of oceans had split apart
the land between the two plates starts to create a valley
When a continental plate is split by movements elsewhere on the plate, it will crack in an area of weakness (along fault lines, namely) and subsequently will form a rift valley. A rift valley consists of two sides (part of the solid plate) and displaced land in the middle, which moves downwards as the two adjacent plates move apart. A rift valley often forms the basin of a river, though not always. A good example of one is the Great Rift Valley in East Africa.
Rift are formed between divergent boundaries, as the plates break apart from each other, a rift is formed between them. Also as they split apart the void between them forms a rift valley. Like the great rift valley in Africa.