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What are Divergent Plate Boundaries?
Boundaries where tectonic plates move apart, often called boundaries of construction.
What is Sea-floor Spreading?
The process that drives plates apart at divergent boundaries, leading to the formation of new oceanic crust.
Who proposed the theory of sea-floor spreading?
Harry H. Hess proposed the theory of sea-floor spreading in 1960.
What is the Mid-Atlantic Ridge?
A divergent boundary that lies beneath the Atlantic Ocean and extends from the North Pole to the South Pole; it is a site of new oceanic crust formation.
What is Oceanic Crust?
Crust formed by lava that spreads across the ocean floor, as a result of sea-floor spreading.
What is the East African Rift Valley?
A region where divergence is occurring on the east side of Africa, causing the continent to split and forming the Red Sea.
What are Black Smokers?
Chimney-like vents on the ocean floor at mid-ocean ridges that emit hot water and contain dissolved minerals and bacteria.
What are the proofs of Sea-floor Spreading?
Existence of mid-ocean ridges. 2. Youngest sea floor at mid-ocean ridges. 3. Similar glacial material and fossils found where continents were once attached.
What are Convection Currents?
The movements in the mantle that drive tectonic plates apart at divergent boundaries.
What is Magma?
Molten rock that fills cracks on the ocean floor; when it reaches the surface, it is called lava.
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