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How would the density of continental crust have to compare with that of ocean crust?
The simlarities between oceanic and continental crust are: 1. I dont know 2. I need help, someone that knows the correct answer please help me asap? This is my exam, but the information is not in my worksheet or either in my textbook
What are the oldest life form on earth?
That depend on your religion. Some religions believe that people were. But if you go for evolution, then its single celled organisms.
In layer of earth do earthquakes occur?
asthenosphere.
Does sediment build up at the continental shelf?
The continental shelves were formed millions of years ago, when most of the land on the Earth was compacted into one huge landmass. After some time, this landmass began to break into smaller pieces, which became the continental shelves. Then they drifted farther and farther apart and appear where they are today.
How did the crust of the earth get split?
A big rock from space could split the crust, or at least punch a hole in it. (And this has happened! And on several occasions.) We've had some really, really big hits, including one that is thought to have resulted in the capture and formation of the moon. A hit that massive didn't simply split the crust, but nearly ripped the earth apart. There is also the action of tectonic plates, as the plates respond to gigantic pressures from below. The actions of the tectonic plates had a hand shaping life on earth, and they continue to affect us today. I very big ways, too. Earthquakes arise when plates shift, as you know, but the divergent rifts on some plate boundaries could actually be considered a "functioning split" because the plates are continuing to move apart, continuing to split. Remember that the crust of the earth is an evolving megastructure. The massive dynamics that shaped it in the past continue to shape it now, even though billions of years of have passed since the crust formed.
Witch term refers to sections of earth's crust and part of the upper mantle?
This is the Continental crust (also some Oceanic), as the crust part of the Lithosphere.
What two types of crust are the tectonic plates made from?
Short Answer: The Earth has two types of crust, continental crust and oceanic crust. Basaltic rocks are the main component of oceanic crust. Continental crust consists mainly of lower density granitic rocks. The Better Answer: Tectonic plates and the Earth's crust are not the same thing. Tectonic plates are made of the Earth's crust, plus the upper layers of the Earth's mantle. Together the crust and the more solid upper mantle form the lithosphere. The crust itself is relatively thin, varying from a few kilometers thick to nearly a hundred kilometers. With the material of the mantle, the tectonic plates are 50 to 200 kilometers thick. Some plates are entirely continental and some are entirely oceanic and some are combined. Continental crust and oceanic crust are different in make up and properties. The continental crust has a density of about 2.7 g/cm3 and is mostly granitic, made of silicate materials with more aluminum and less iron and magnesium. Continental crust is generally thicker, in the range of 25 to 70 kilometers. Oceanic crust is more dense (density of about 2.9 g/cm3) and the average oceanic thickness is in the range of 7-10 kilometers. Oceanic crust is primarily basalt, composed of silicate material which is rich in iron and magnesium. Though only 40% of the Earth's surface is continental crust, there is more of it because it is thicker. Continental crust is about 70% of the volume of Earth's crust. Both types of crusts are less dense than the material of the Earth's mantle (density of about 3.3 g/cm3), so the "float" on the mantle.
Why is the oldest ocean crust only 150 million years old?
Because the oldest parts reach the continental crust and then the ocean floor sinks beneath the continental crust, into the mantle.
What does the outter most layer of the earth consist of?
The thin, solid, outermost layer of the Earth is officially known as the crust.
Is Mount Kilimanjaro made of continental crust or oceanic crust?
Of course it's continental crust! If it were made of oceanic crust, it would be underwater or some large island starting at the bottom of the ocean floor!
What happens when oceanic crust and continental crust collide?
Subduction occurs on continental boundaries because oceanic sub floor is denser and heavier than the lighter more buoyant crust. The oceanic crust slides under the continental crust areas usually on a plate boundary. This is in a recycle style mode that constantly is remaking the ocean floor. The oldest rocks on the ocean bottom are a drop in the geologic time bucket, compared to the rock ages on land.
Is the continental crust made of igneous rock?
some is, some isn't.
How many times thicker is the continental crust to the oceanic crust?
The continental crust is about 35 to 40 kilometers thick, while the oceanic crust averages at about 7-10 kilometers thick. This means that the continental crust is about 3.5 to 4 times the thickness of the oceanic crust.
How old is the Continental plate?
The oldest continental crust is found in large, stable areas with little seismic/volcanic activity found in the centre of continents, called Cratons. Examples of these are Yilgarn Craton in Australia, and the Kaapvaal Craton in South Africa. The oldest rocks found within these cratons can be up to 3.8 billion years old (3,800 million). However, because the forces of erosion and deposition are always at work creating new rocks, continental crust also contains much younger rocks - some only a few hundred thousand years old. In short, there is no specific age for continental crust, and unlike oceanic crust that is created and destroyed at a fairly constant rate, continental crust is less dense and thus doesn't undergo subduction at plate boundaries. Less "recycling" means older rocks are more likely to survive.
How many tectonic plates are composed of only continental crust?
none they all contain some oceanic crust
What is a sentence using the term Earth's crust?
The crust is the top layer of the earth. Here are some sentences.Earth's crust can be many miles thick.Below Earth's crust is the mantle.Earth's crust is broken into many plates, which shift about on the liquid interior.We live atop Earth's crust.
Do lithospheric plates include both continental crust and oceanic crust?
It is possible to have continental and oceanic crust on the same plate. The only to this exception is with the Pacific plate which exists independently.
