a looplike bend in a river formed when slow-moving water deposits sediment on the inside curve of the river (p. 716)
the number of times that a machine increases an input force (p. 421)
the energy associated with the motion and position of everyday objects (p. 450)
a disturbance in matter that carries energy from one place to another (p. 500)
the process of physically breaking rock into smaller fragments (p. 710)
the material through which a wave travels (p. 500)
the temperature at which a substance changes from solid to liquid (p. 47)
the lower portion of Earth's mantle (p. 662); the layer of Earth's atmosphere immediately above the stratosphere (p. 750)
elements that are good conductors of heat and electric current (p. 135)
the attraction between a metal cation and the shared electrons that surround it (p. 176)
elements with properties that fall between those of metals and nonmetals (p. 136)
rock that has been changed by temperature, pressure, or reactions with hot water (p. 674)
a chunk of rock that moves through the solar system (p. 797)
scientist who studies and tries to predict weather (p. 774)
an optical instrument that uses lenses to provide enlarged images of very small, near objects (p. 584)
a chain of underwater mountains (p. 678)
a naturally occurring, inorganic solid with a crystal structure and a definite chemical composition (p. 665)
a false or distorted image (p. 548)
a representation of an object or event (p. 10)
the number of moles of a dissolved solute per liter of solution (p. 239)
the mass of one mole of a substance (p. 196)
an amount of a substance that contains approximately 6.02 × 1023 particles of the substance (p. 195)
a neutral group of atoms that are joined together by one or more covalent bonds (p. 166)
the product of an object's mass and its velocity (p. 374)
a small organic molecule that joins with other monomers to form a polymer (p. 275)
a wind system that shows a seasonal reversal of direction (p. 759)
a relatively small natural body in space that revolves around a planet (p. 792)
mounds of till formed at the downhill end of a glacier and along its sides (p. 721)
N
- neap tide
a tide at the first or last quarter moon, when there is the least change between daily high and low tides (p. 801)
- nearsightedness
an eye condition in which distant objects are blurry (p. 590)
- nebula
a large cloud of gas and dust spread out over a large volume of space (p. 840)
- net force
the overall force acting on an object after all the forces are combined (p. 357)
- network solid
a solid in which all the atoms are linked by covalent bonds (p. 263)
- neutralization
a chemical reaction between an acid and a base (p. 244)
- neutron
a neutral subatomic particle that is found in the nucleus of an atom (p. 109)
- neutron star
the dense core left after a high-mass star has exploded as a supernova (p. 844)
- newton (N)
the SI unit for force, equal to the force that causes a 1-kilogram mass to accelerate at a rate of 1 meter per second squared (1 N = 1 kg∙m/s2) (p. 357)
- noble gases
the elements in Group 8A of the periodic table (p. 145)
- node
a point on a standing wave that has no displacement from the rest position (p. 512)
- nonlinear graph
a graph in which the displayed data form a curved line (p. 348)
- nonmetals
elements that are poor conductors of heat and electric current (p. 136)
- nonrenewable energy resource
a source of energy that exists in limited quantities and, once used, cannot be replaced except over the course of millions of years (p. 462)
- nuclear energy
the energy stored in atomic nuclei (p. 452)
- nuclear radiation
charged particles and electromagnetic waves that are emitted from the nuclei of radioisotopes (p. 293)
- nucleic acid
a large, nitrogen-containing polymer, found mainly in the nuclei of cells (p. 279)
- nucleus
the dense, positively charged mass located in the center of an atom (p. 105)
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