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Tolli/Stapp 12
Layers of Earth - 6.10A
Term | Definition |
---|---|
Inner Core | The sphere of solid nickel and iron at the center of Earth; surrounded by the liquid outer core. |
Outer Core | The outer layer of Earth’s core; surrounds the inner core and is made of liquid nickel and iron. |
Mantle | The solid layer of Earth between the crust and the core; made of dense silicates. |
Crust | The thin, solid outermost layer of Earth; made of less dense silicates and is either continental (landmasses) or oceanic (ocean floors). |
Lithosphere | The cool, rigid, outermost layer of Earth that consists of the crust and the uppermost part of the mantle; broken into pieces or segments called plates. |
Asthenosphere | The solid layer with plasticity in the upper mantle that is located just below the lithosphere; lithospheric plates “float” and move on this layer. |
Plasticity | A characteristic of the material in the asthenosphere; existing in a solid state yet having the ability to flow without being a liquid. |
Earth’s Layers | The divisions of the composition of Earth determined by either chemical composition or by the physical state of matter. |
Chemical Composition | The types, quantities, and arrangements of elements that make up a substance. |
Physical Properties | Measureable characteristics that describe the physical state of something, including mass, magnetism, temperature, density, shape, volume, and conductivity. |
Temperature | A measure of the amount of heat energy. |
States of Matter | Distinct forms of matter known in everyday experience: solid, liquid, and gas; also referred to as phases of matter. |
Pressure | Force exerted on matter through contact with other matter; affects melting and boiling points. |
Density | The amount of matter in a given space or volume; it is a relationship between mass and volume. Less dense matter will form layers above dense matter. |