inner core The central part of Earth's core, believed to be solid, and composed mainly of nickel and iron.
intensity A basic property of electromagnetic radiation that specifies the amount or strength of the radiation.
inner core
0-1250 km
Earth's interior consists of a crust, mantle, outer core, and inner core. The crust has a low density and is silica-rich on the surface and silica-poor in the interior.
Inner core: 1.7% of the Earth's mass; depth of 5,150-6,370 kilometers (3,219 - 3,981 miles)
The inner core is solid and unattached to the mantle, suspended in the molten outer core.
inner core - the solid iron-nickel center of the Earth that is very hot and under great pressure.
Inner core
12.8-13.1
The internal heat of the planet is most likely produced by the radioactive decay of potassium-40, uranium-238 and thorium-232 isotopes. All three have half-life decay periods of more than a billion years.
= inner core revealed
earth size, carbon/oxygen, hot (white), faint
density ~ 5 × 10 5 g/cm3
electron degenerate pressure support
degeneracy pressure independent of temperature
more massive WDs are smaller
limiting mass 1.
The inner core is generally believed to be solid and to be composed entirely of iron and some nickel. Some believe it may be entirely composed of a single iron crystal.
The inner core appears
to have an unexpectedly
complicated subcore
structure of its own (more
from BBC On-Line News).
Solid inner core, liquid outer core
Few craters, large continents, organized volcanism, erosion
200-315 K ...
Hundreds of dikes can invad the cone and inner core of a volcano, sometimes preferentially along zones of structural weakness. Dione (NASA Thesaurus / NASA SP-7, 1965) A satellite of Saturn orbiting at a mean distance of 378,000 kilometers.
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.
The inner core has a radius of about 600 mi (1,000 km), about 2/3 of the radius of the moon itself. The internal temperature decreases from 830°C; (1,530°F;) at the center to 170°C; (340°F;) near the surface.
In contrast, the inner core, with a radius of about 1275 km (about 795 mi) is probably solid. Both core layers are thought to consist largely of iron, with a small percentage of nickel and other elements.
After enough iron in the core is accumulated, within one hundredth second, the inner core collapses and heats up dramatically. All fuel, if not burnt up yet, will fuse to iron and nickel. The outer core will also collapse with the inner core.
0- 40 Crust 40- 400 Upper mantle 400- 650 Transition region 650-2700 Lower mantle 2700-2890 D'' layer 2890-5150 Outer core 5150-6378 Inner core The crust varies considerably in thickness, it is thinner under the oceans, thicker under the continents.
Marvin (1996) Substructure of the inner core of the Earth Vol. 93, Issue 2, 646-648, January 23, 1996, PNAS
Hollenbach, D. F. and J. M.
If we adopt 5000 as not unreasonable, then the inner core is just a tenth of a light year across, while the outer assembly extends 3.5 light years from one extreme edge to the other.
The lithosphere (continental crust) is about 80 km thick; below that is a rock mantle about 2800 km thick; the outer core is liquid and predominantly iron, with a radius of 3500 km; and the inner core is solid iron probably in crystalline form, ...
Beneath the mantle, an extremely low viscosity liquid outer core lies above a solid inner core. The inner core may rotate at a slightly higher angular velocity than the remainder of the planet, advancing by 0.1-0.5° per year.
Finally, the inner core is 2740 km thick and consists of solid iron and nickel. The temperature at the core is approximately 4500°C. The crust is made of many vast 'plates' that are constantly moving very slowly.
The Earth is believed to have a solid inner core, made mostly of iron and nickel. This is surrounded by a liquid outer core, also mostly iron and nickel.
The Earth is made up of several layers. There is an outer solid crust, then a mantle, then a liquid outer core, and finally a solid inner core.
red giant
A relatively cool star which is near the end of its life, swelling in size after the inner core has been depleted of hydrogen.
Sakurai's Object has ejected a large amount of the carbon from its inner core into space, both in the form of gas and dust grains.
Below Earth's surface are layers of rock and metal. Temperatures increase with depth, all the way to about 12,000 degrees Fahrenheit at Earth's inner core.
In addition, the tidal forces from Jupiter make the surface of Io flex up and down, keeping the inner core of this moon molten.
The remaining bulk, still several times more massive than the Sun, collapses into a single point of infinite density, called a singularity. Neutron stars form through a similar process, only from a slightly less massive star in which the inner core ...
White dwarfs are the evolved remains of Sun-like stars, which have cast off their hydrogen-rich outer layers to reveal inner cores of containing lots of oxygen.
The inner core consisted of heavier elements, as well as a cultural archive of a race from 87 million years in the past. The comet's outer shell was vaporized by the Enterprise in the course of investigating the comet and the archive.
is the lighter rocky crust, below it to 2890 km the denser mantle, in which several layers are distinguished. Below that is the dense, liquid core, believed (from its density) to be mainly iron, and in its middle the solid inner core ...
The proton-proton cycle, as it is now called, is known to be responsible for about 98% of the Sun's energy production in its inner core. Bethe won the 1967 Nobel Prize in Physics for his work concerning energy production in stars.
 See also: Core, Earth, Planet, Sun, Time
  
|
RSS
