Recently, we've talked about the inner layers of the Earth and that scientists believe that there is a solid core surrounded by a liquid outer core. We also know that the solid crust sits on top of a semi-liquid layer called the asthenosphere which allows the tectonic plates to move and shift over time. This shifting of tectonic plates is responsible for earthquakes, many volcanoes, and the formation of mountain chains. But how do scientists know about the middle of the Earth when we have only traveled a few miles below the surface?
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Go to the following website: Seismic Waves
Read the page and go through the activity, answering the questions and checking your answers.
Write a short (a couple of sentences) explanation of how scientists know about the layers of the Earth.
16 comments:
Scientists know that Earth has layers because of high tempatures, and large amounts of pressure. Another way scientists know this is because of indirect measurements and seismic waves measurements of Earthquakes. This allows the scientists to predict what the Earth is like deep underground.
The pressure in one of many things that let them know that the earth has layers. And and from high temperatures and scientists sometimes do it themselves like they use measurements and waves from from earth quakes.
Scientist know about the layers of earth because seismic waves, these waves are caused by earthquakes. The seismic waves go throw the deep in the Earth, the waves track movement of the Earth’s crust. They can track the waves by a device called seismograph.
-Jade!
scientists know the earth has layers because of the high temperatures. Another way is seismic waves. Still another way is the pressure.
Scientists know about the earth crust because of earthquakes which has seismic waves, which scientists can pick up on a seismograph. This lets them know when there will be an earthquake and how devastating it will be, as long with what’s going on under the ground.
Using sensitive vibration detectors scientists can determine where the vibration came from and what substances it had to go through to get to the surface.
Scientists know that Earth has layers because of high tempatures, and large amounts of pressure. They study scape to get a better understanding of the earth.
(this is from the one on the 3rd)
Krakatoa, or Krakatau, is a volcano on an island made with a'a lava. Krakatoa is part of a group of volcanoes in the Sunda Strait in Indonesia.
The eruption that is best known occured between August 26th to 27th in 1883. That eruption is considered the most extreme volcanic eruption in history. The eruption would be equal to 200 megatons of dynamite. 5.0 cu mi of rock, ash and pumice were spewed out during the eruption. One hundred sixty five towns were demolished by the eruption and one hundred thirty two villages were extremely hurt. The official toll of deaths was 21,007 people, and thousands were injured.
Scientists used earth quakes and seismic waves to learn about the inside of the earth. The measurements, tough incorrect, helped a lot. Also high temperatures and tremendous pressure coming from the earth gives them a clue.
The scientists know that the earth has layers because of the amounts of pressure and temperatures of the Earth. They know which layers are there because of the seismic waves, which are measured during earthquakes.
Scientists believe that the earth has layers because of high temperatures and massive numbers of pressure. They establish that using indirect measurements and seismic waves that explore the inner depths of the earth and they are measured with detectored by the scientists, they can confirm that there beliefs are true.
Scientists know about the middle of the Earth even thought they have never been there by using indirect measurements and seismic waves from earthquakes to determine the Earth's internal systems. This is how they know whats in the Earth's center.
Scientists found out about the earths layers by using high temperatures and seismic waves. Another thing that helped the scientists was very large amounts of pressure and indirect measurements. The seismic waves are picked up on seismograph which is a piece of equipment that helps you determine things like when an earthquake is going to happen and how badly it will hit.
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