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OCEAN FLOOR ANALYSE AND CONCLUSION - Coggle Diagram
OCEAN FLOOR ANALYSE AND CONCLUSION
CONTINENTAL SHELF
A broad, relatively shallow submarine terrace of continental crust forming the edge of a continental landmass.
ABYSSAL PLAINS
Flat seafloor area at an abyssal depth (2000-5000 m). They present an irregular topography with small mountains, volcanoes and dips, called ocean trenches.
OCEAN RIDGES
They are mountain chains created by volcanoes under the water. There is a large top-to-bottom cleft called rift.
IN THE RIDGES
In the ridges lithosphere crack continuously. The magma rise to the surface through rift, then it gets cold and solidifies. This way new lithosphere is built.
ON THE TRENCHES
On the trenches lithosphere is destroyed. There, the rocks penetrate the mantle and melt.
The ocean floor is the botton of the ocean, also called as "seabeds". The ocean drift was discovered because of theese three structures:
DID YOU KNOW?
Humans impact in the ocean is really big!
The seabeds have been analysed by submersibles and some scuba divers with special suits. In recent years satellite images have been used in the study and exploration of the ocean floor
Plastic pollution! A 2020 study revealed estimated that Earth's seafloor contains ~14 million tons of microplastic
Deap sea mining! There is a mining technique that consists in mining coastal waters, where sand, tin and diamonds are more readily accessible
FACTS THAT VERIFY THE HYPOTESIS
There are aligned volcanoes in the ridges, where magma erupts.
The rocks of the ocean floors are 200 million years old, while rocks that form the continents are 4500 million years old.
The age of the rocks on both sides of the rift are symmetrically the same, the further away, the older.
Analysing the sediments of the ocean floor, their thickness increases the further they are from the rift.
