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en.wikipedia.org/wiki/Structure_of_the_Earth

The interior structure of the Earth is layered in spherical shells. These layers can be defined by ... Earth's average density can be determined through gravitometric experiments, which have historically involved pendulums. The mass of Earth is ...

www.answers.com/Q/Why_is_it_difficult_to_determine_earths_inner_structure

They porduce youmama and fu yall It is difficult to determine Earth's inner structure because of all the layers. The Earth altogether is made up of seven layers.

study.com/academy/lesson/how-scientists-study-earths-interior-structure.html

We can't see what Earth's interior is made of, but scientists are able to study it in ... Even if you could dig down that far, you would have a difficult time getting ...

pubs.usgs.gov/gip/interior

Jan 14, 2011 ... Other important data on the Earth's interior come from geological ... structure and composition than about the structure and composition of the ...

phys.org/news/2015-12-earth-layers.html

Dec 7, 2015 ... Our modern, scientific understanding of the Earth's interior structure is ... of the Earth's deep interior, to determine what Earth's layers looks like.

www.scientificamerican.com/article/how-do-scientists-determi-2005-07-25

Aug 23, 2004 ... Much of our understanding of the basic structure and composition of Earth and the other planets in our solar system is not strenuously debated.

www.windows2universe.org/earth/Interior_Structure/interior.html

Jan 18, 2010 ... Earth has a diameter of about 12,756 km (7,972 mi). The Earth's interior consists of rock and metal. It is made up of four main layers: 1) the inner ...

sciencing.com/do-scientists-structure-earths-interior-8695198.html

Apr 25, 2017 ... Although the interior of the Earth is not directly visible, scientists can use a variety of methods to create a profile of the Earth's crust, mantle and ...

www.amnh.org/explore/resource-collections/earth-inside-and-out/inge-lehmann-discoverer-of-the-earth-s-inner-core

Dr. Inge Lehmann (1888-1993), discoverer of the Earth's inner core. ... through Earth and across its surface—to reveal the structure of the interior of the planet.