Definitions of scientific words
Dense:closely compacted in substance.
layer:a sheet, quantity, or thickness of material, typically one of several, covering a surface or body.
silicon:silicone, also called polysiloxane, any of a diverse class of fluids, resins, or elastomers based on
polymerized siloxanes, substances whose molecules consist of chains made of alternating silicon and
oxygen atoms.
oceanic crust:the relatively thin part of the earth's crust which underlies the ocean basins. It is geologically
young compared with the continental crust and consists of basaltic rock overlain by sedime
Continental crust:continental crust, the outermost layer of Earth's lithosphere that makes up the planet's
continents and continental shelves and is formed near subduction zones at plate boundaries between
continental and oceanic tectonic plates. The continental crust forms nearly all of Earth's land surface.
below:at a lower level or layer than.
magnesium:the chemical element of atomic number 12, a silver-white metal of the alkaline earth series. It
is used to make strong lightweight alloys, especially for the aerospace industry, and is also used in
flashbulbs and pyrotechnics because it burns with a brilliant white flame.
upper mantle: The upper mantle is defined as that part of the mantle between the crust and the phase
transition of γ-olivine to perovskite. The total mass of the upper mantle is 1.06 × 1024 kg, about a quarter
of the total mass of the mantle.
lower mantle: the deeper part of the mantle. layer - a relatively thin sheetlike expanse or region lying over
or under another. mantle - the layer of the earth between the crust and the core.
outer core:The outer core is the third layer of the Earth. It is the only liquid layer, and is mainly made up of
the metals iron and nickel, as well as small amounts of other substances. The outer core is responsible
for Earth's magnetic field. As Earth spins on its axis, the iron inside the liquid outer core moves around.
inner core:The solid material found in the center of some planets at extremely high temperature and
pressure, distinct from the liquid outer core. (geology) The innermost part of the Earth, believed to be
made of a nickel-iron alloy.
iron:a strong, hard magnetic silvery-gray metal, the chemical element of atomic number 26, much used as
a material for construction and manufacturing, especially in the form of steel.
magnetic field:a region around a magnetic material or a moving electric charge within which the force of
magnetism acts.
Inferred:deduce or conclude (information) from evidence and reasoning rather than from explicit
statements.
Nickel:a silvery-white metal, the chemical element of atomic number 28.
hydrosphere:all the waters on the earth's surface, such as lakes and seas, and sometimes including water
over the earth's surface, such as clouds.
Atmosphere:the envelope of gases surrounding the earth or another planet.
Lithosphere:the rigid outer part of the earth, consisting of the crust and upper mantle.
asthenosphere:the upper layer of the earth's mantle, below the lithosphere, in which there is relatively low
resistance to plastic flow and convection is thought to occur.
Definition