Exploring the Earth's Core ... How was the Earth's core discovered? Recordings of seismic waves from earthquakes gave the first clue. Seismic waves will bend and reflect at the interfaces between different materials, just like the prism below refracts and scatters light waves at its faces.
www.seismo.unr.edu/ftp/pub/louie/class/100/interior.htm... www.seismo.unr.edu/ftp/pub/louie/class/100/interior.html
Inner core - Wikipedia, the free encyclopedia
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The inner core of the Earth, its innermost hottest part as detected by seismological studies, is a primarily solid sphere about 1220 kilometer in radius, only about 70% that of the Moon. It is belie...
en.wikipedia.org/wiki/Inner_core
; Beneath the mantle is the Earth's core. The Earth's core consists of a fluid outer core and a solid inner core. Because the outer core contains iron, when it flows it generates a magnetic field. This is the source of the Earth's magnetic field.
www.thetech.org/exhibits_events/online/quakes/inside/co... www.thetech.org/exhibits_events/online/quakes/inside/core.html
Core: The Earth has a iron-nickel core that is about 2,100 miles in radius. The inner core may have a temperature up to about 13,000°F (7,200°C = 7,500 K), which is hotter than the surface of the Sun. The inner core (which has a radius of about 750 miles (1,228 km) is solid.
www.enchantedlearning.com/subjects/astronomy/planets/ea... www.enchantedlearning.com/subjects/astronomy/planets/earth/Inside.shtml
Subject: The Composition of the Earth's Core ... How do scientists know what is in the core of the earth? ... These must be in the core.     Seven, to aid us in our assessment, we recall that we need metallic elements in high concentration somewhere in the interior of the Earth to generate our magnetic field. Also,
www.soest.hawaii.edu/GG/ASK/earths_core.html www.soest.hawaii.edu/GG/ASK/earths_core.html
The Moon, our fellow-traveler in space, has a diameter half that of the Earth's core, and it rotates around the Earth, as all the planets rotate around the Sun, under the force of gravity.
pubs.usgs.gov/gip/interior/
Unlike the yolk of an egg, however, the Earth's core is actually made up of two distinct parts: a 2,200 km-thick liquid outer core and a 1,250 km-thick solid inner core. As the Earth rotates, the liquid outer core spins, creating the Earth's magnetic field.
pubs.usgs.gov/publications/text/inside.html
Scientists know that the outer layer of the earth is made of solid rock and that it warms as you dig deeper. Actual evidence exists down to a depth of about eight kilometers (five ... Beneath the crust is a layer of rock called the mantle. Even deeper is the core which scientists believe is made of solid iron and nickel.
sln.fi.edu/earth/core.html sln.fi.edu/earth/core.html
Question: How far down is the core of the Earth ? burbank school Answer: Actually, the Earth has two cores--the inner core and the outer core. The inner core is solid and is about 5100 kilometers down (approximately 3150 miles).
www.newton.dep.anl.gov/askasci/gen99/gen99175.htm
Earth has a diameter of 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 core: a solid metal core made up of nickel and iron (1200 km diameter) ;
www.windows.ucar.edu/tour/link=/earth/Interior_Structur... www.windows.ucar.edu/tour/link=/earth/Interior_Structure/interior.html
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