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They study the layers by seeing how seismic waves travel through the earth. By the time of the arrival, and how the frequencies of the waves are arranged within each set they can tell things about the density and other things about the layers.
Wiki User
∙ 9y ago
Wiki User
∙ 10y agoGeologists use different types of evidence to create theories about different layers of the Earth.
Firstly, for crustal rock, we can simply drill down or use seismic surveys to see what rocks are in the crust, so are confident that the crust is definately made of these rocks.
The mantle however is harder to get to, and one method geologists use to find out the composition of the mantle is the use use of Kimberlite Pipes. Kimberlite Pipes are deep pipes which eject material directly from the mantle, giving some suggestions as to what it is made up of. However no one knows for sure if this is the complete composition of the mantle, and the lower mantle for sure hasn't been touched.
The inner core and outer core of the Earth have thought to be composed of a nickel-iron alloy, as well as some silicate minerals (eg O, K, Al etc) being in the outer core. This has been theorised by the use of metallic meteorites. Geologists suggest that meteorites form in exactly the same way that the Earth has, ie the denser metallic minerals when molten sunk to the middle of the Earth, and the less dense, silicate minerals rose to the surface. Studying the centre of fallen or orbiting meteorites has helped create theories about these deep layers of the Earth.
Hope this helps :)
Wiki User
∙ 14y agoThrough the use of seismometers and the knowledge they have of convection currents.
Wiki User
∙ 14y agoSeismology: the study of seismic activity.
Wiki User
∙ 13y agoseismic waves.
Wiki User
∙ 13y agoReflection and refraction seismology.
Wiki User
∙ 10y agoim cave mn stv isay so
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Can scientists know where past earthquakes were?
By looking at the rocks and the way the layers of rock are stacked scientist feel they have pretty good idea of the time and severity of many past earthquakes.
What two minor layers are parts of the main layer of earth's atmosphere?
One is the ozone layer which protects us from ultraviolet rays of the sun.I don't know about any others
The scientist of wegeners should have rejected his idea?
no because then they would know least about the world
Does earth have liquid water on its surface?
Earth is the main planet with liquid water. There are some studies which say that Neptune and Uranus also contain water, deep inside them. However, only the Earth has liquid surface water.
Why are map showing locations of past earthquakes useful to scientists?
Earthquakes happen when the Earth's crust shifts violently. So if we know that an earthquake has happened in California, then scientist know that the crust under California is unstable, therefore making earthquakes more likely to happen there. Earthquakes can happen anywhere, but the tend to happen repeatedly in certain spots
How do scientist learn about changes on earth from rocks?
Scientists study layers of rocks to learn about the earth and how it has changed. They know that if layers are undisturbed, the oldest rocks are on the bottom and the youngest rocks are on top. They know how old each layer is in relation to the other layers.
How do you know that the earth is in layers?
how do we know about the earth's layers when we never drilled that far down?
Why are ice layers important to know?
ice layers are so important to know because describes the history of the ice layers. so scientist can study the ice layers.
What method do scientist use to know how thick the earth's layers?
they use a drill that has a level that tells them what thing the drill is drilling the drill but is made of gold
How do scientist know the inside of the earth is made of layers?
each layer in earth has diffrent material that is cuse diffrent propertis. natural or man made Wave when it come from inside of the earth show difftent propertis .this is main reason of layering earth .
How many layers does earth have and what are the names?
there are 4 layers and i dont know what they are called
Why should you know about earths layers?
we should know it is our earth
Why is the wooly momoth extinct?
Because a big mediator hit the earth and had many animals extinct. Scientist know this because the layers of the dirt has a substance only made from space.
How do you know what you know about the center of the earth?
we drill very deep in the earth .
What else did the scientist didn't know that live on earth?
If we do not know we can not answer.
How does a scientist know the age of the Earth?
by studying artifacts found on earth
How do you know about the inner layers of the earth?
Sound waves.
