1) Divergent boundaries because they cause new crust to form.
2) MORS are underwater mountain ranges that rise to connect with the continents and form new crust. The lava gets pushed under the oceanic crust.
In the mid-twentieth century and corroborated ever since, researchers dredging the seafloor could not find any materials older than 180 million years.
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What do you understand by seafloor ?</h3>
The surface of an ocean or sea: seafloor According to this theory, the Earth's crust is divided into a number of enormous plates that together form the continents and ocean floors and are supported by a warm, plastic "mantle" beneath the surface. Mr. Walter Sullivan
Deposits of common minerals like copper, zinc, nickel, gold, silver, and phosphorus can be found on the seafloor. These deposits are nodules on silt from the abyssal plain that are typically 3 to 10 centimeters (1 to 4 inches) in diameter and appear as crusts on volcanic and other rocks.
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Answer:
Plate tectonics
Plate tectonics is the scientific theory explaining the movement of the earth's crust. It is widely accepted by scientists today. Recall that both continental landmasses and the ocean floor are part of the earth's crust, and that the crust is broken into individual pieces called tectonic plates
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The architecture of a kelp forest depends on its physical structure, which influences the species that occupy the forests. Kelp forests usually include three types of kelp and two types of algae:
1. Prostrate kelps lie near and along the sea floor and form the lowest level of kelps
2. Stipitate kelps are above the prostrate kelps upto a few meters above the seafloor.
3. The Canopy kelps include the largest species of kelp and often extends to the top of the ocean surface.
4. Coralline algae directly and often extensively cover geologic substrate i.e the sea floor.
5. The benthic assemblage is composed of other algal species.
