Answer:
Oceanic, Seafloor Spreading, Submarine Volcanic, Rift Valleys, Great african
Explanation:
DIVERGENT PLATE MARGIN (Also known as a constructive boundary or an extensional boundary)
Here two plates moves __away__________from each other. Molten rock, or magma, immediately rises to fill any possible gap and forms new <u>oceanic</u> crust. When this happens underwater, it is described as <u>seafloor spreading</u>. Huge underwater <u>submarine volcanic</u> ranges are formed from magma coming up from the mantle. Over time these submarine volcanoes may become large enough to reach the surface .eg. Iceland in the North Atlantic Ocean.
Where plates move apart on land, <u>rift valleys</u> are formed. An example of this is the <u>Great African</u> Rift Valley.
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The evidence is when there is degradation. it is characteristic of channel networks in which either bedrock<span> erosion is taking place, or in systems that are </span>sediment<span>-starved and are therefore entraining more material than is being deposited. When a stream degrades, it leaves behind a </span>fluvial terrace<span>. This can be further classified as a </span>strath terrace<span>—a bedrock terrace that may have a thin mantle of </span>alluvium<span>—if the river is incising through bedrock.</span>
North and Central <span>Asia</span>
