0
Due to the processes of plate tectonics, new oceanic crust is in a constant cycle of production and destruction. The cycle of creation to destruction occurs in roughly 200 million year intervals--not a huge span in geologic time. The ocean floor is therefore composed of basaltic rock that ranges in age from brand new to 200 million years old. Continental rock is generally a great deal older; some formations are over 4 billion years in age.
Wiki User
∙ 12y ago
Wiki User
∙ 15y agoThey are younger because they are located near spreading centers. At spreading centers, upwelling magma forms oceanic crust. At convergent plate boundaries, oceanic lithosphere subducts under continental lithosphere because it is more dense. The constant recycling of oceanic crust is why it is younger than continental crust.
Wiki User
∙ 11y agoThe ocean floor is constantly recycling itself though a process called subduction by which the oldest layers of the oceanic crust, which are heavier, are driven under the lighter layers of either oceanic crust or continental crust where they descend to depths in the earth that melt them into magma. This happens at what are called subduction zones. These zones are in areas of the greatest volcanic activity, generally speaking.
In addition the ocean floor is constantly being covered by sediment from nearby lands and from the sea life in the water above. As a result, even portions of the floor not anywhere near a subduction zone will be deeply covered with sediment so any very old rocks can be thousands of feet under the sediment and not readily found.
Wiki User
∙ 12y agoIt's because new oceanic crust is continually being created at plate boundaries; these gradually cover more distant (and therefore older) crust, so the oldest rocks in the oceanic crust is usually less than 200 million years old.
Wiki User
∙ 9y agoThere are no rocks on the ocean floor because they turn to sand. The moving of the water gradually wears away at the rocks.
Wiki User
∙ 12y agobecus most old rocks are rar and they are a part of historey
Wiki User
∙ 8y agoOld rocks are hard to find on the ocean floor because new rock forms on top of the old rock.
Add your answer:
Earn +20 pts
Can rocks talk to you?
Rocks can talk, but it is very rare. This is very rare since rocks have to be sad to talk to humans. So it is normally good if they don't talk to you since they are happy, but sometimes they are angry.
Do rocks talk or are you crazy?
Rocks can talk, but it is very rare. This is very rare since rocks have to be sad to talk to humans. So it is normally good if they don't talk to you since they are happy, but sometimes they are angry.
Is sandstone rare to find?
no not rare to find
Are tsunamis rare?
They are very common, and they happen in the ocean. They mostly happen in the pacific ocean like the 2004 Boxing day tsunami
What is an anorthite?
An anorthite is a form of feldspar which is abundant in moon rocks, but very rare on Earth.
What if old rocks are rare are on the ocean floor?
It is believed that old rocks are rare on ocean floors bevause the floor has manny remains and we are not unable to reach them
Why do you think that old rocks are rare one ocean floor?
There are no rocks on the ocean floor because they turn to sand. The moving of the water gradually wears away at the rocks.
Where can you find red shards?
You can find all colored shards in the sea floor of Pokemon Sapphire/Ruby. Dive in the dark spots in the ocean around Sootopolis and Mossdeep. There will be slightly hard to see rocks at the bottom (kinda rare) and you press A when next to one. I don't know which rocks have which items.. All I have found are some heart scales, but keep trying, and good luck.
Can you find swans on an ocean?
It is possible, but it is rare.
Where can you find rare rocks in New York?
In a rock shop.
Would you find fossils in metamorphic rock?
You can but it very very rare. you are more likely to find them in sedimentary rocks.
Is it possible for a piece of a mountain to end up at the bottom of an ocean?
It really depends on how big of a piece you are talking about. A clay sized pieces of a mountains (weathered from feldspar) make up the sediments that cover the ocean floor. Dust sized pieces are often found on the ocean floor. They are produced by volcanic eruptions as in dust and ash clouds that can circle the Earth. If you are considering a car sized piece, then there are some possibilities. One is that it is rafted by an iceberg (formerly a part of glacier). And, in some rare cases, uprooted trees can carry large rocks out to sea. The rocks come loose of the roots and simply drop.
How do you find rare candies Pokemon pearl?
They are on the floor in poke balls in lots of different routes.
Where do you find a rare candy on Pokemon silver?
You can find rare candies by smashing rocks anywhere and also by using your dowsing rod(in your key items) and use it 2 find items in caves with roks that AREN'T breakable.
Where can you get a relicanth on Pokemon Emerald?
You find them at the bottom of the ocean when you use dive, but there rare, so you won't find them very often.
Gems are a rare subgroup of what?
rocks
What does peak object look like on soul silver?
Peak objects are small rocks, mossy rocks, and big rocks. These are used to help find rare pokemon. If you have any further questions be sure to post a message on my board.
