10Th Chem W

Front 1

waning the phase of the moon during which the moon's sunlit area as seen from Earth is decreasing; the phase after the full moon and before the new moon

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waning

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warm front the front edge of an advancing warm air mass that replaces colder air with warmer air

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warm front

Front 3

wastewater water that contains wastes from homes or industry

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wastewater

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water budget gains, losses, and storage of water in a region; the relationship between evaporation, precipitation, and runoff

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water budget

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water cycle the continuous movement of water between the atmosphere, the land, and the oceans

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water cycle

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waterfowl an aquatic bird, such as a duck, goose, or swan

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waterfowl

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water gap a deep, narrow pass across a ridge, mountain, or other elevated area through which a river or stream flows

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water gap

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water of hydrationwater present in a definite amount and attached to a compound to form a hydrate; this water can be removed, as by heating, without altering the composition of the compound

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water of hydration

Front 9

water pollution the introduction into water of waste matter or chemicals that are harmful to organisms living in the water or to those that drink or are exposed to the water

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water pollution

Front 10

watershed the area of land that is drained by a river system

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watershed

Front 11

waterspout a tornado that occurs over a water surface

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waterspout

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water table the upper surface of underground water; the upper boundary of the zone of saturation

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water table

Front 13

water vascular system a system of canals filled with a watery fluid that circulates throughout the body of an echinoderm

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water vascular system

Front 14

watt the unit used to express power; equivalent to a joule per second (symbol, W)

Back 14

watt

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wave a periodic disturbance in a solid, liquid, or gas as energy is transmitted through a medium

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wave

Front 16

wave-built terrace a gently sloping surface of a wave-cut terrace that results from deposition of sediments in the deeper water along the shore

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wave-built terrace

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wave-cut terrace a gently sloping surface that is carved by wave erosion and that extends from the base of a cliff into the sea

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wave-cut terrace

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wave cyclone a cyclone that forms and moves along a front, and that produces a wavelike deformation of the front

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wave cyclone

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wavelength the distance from any point on a wave to an identical point on the next wave

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wavelength

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wave period the time required for identical points on consecutive waves to pass a given point

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wave period

Front 21

wave speedthe speed at which a wave travels through a medium

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wave speed

Front 22

wave velocity the speed and direction at which a wave travels through a medium

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wave velocity

Front 23

waxing the phase of the moon during which the moon's sunlit area as seen from Earth is increasing; the phase after the new moon and before the full moon

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waxing

Front 24

weak acid an acid that releases few hydrogen ions in aqueous solution

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weak acid

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weak electrolyte a compound that dissociates only to a small extent in aqueous solution

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weak electrolyte

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weak electrolytethe time when an animal's dependence on its mother for food (milk) and protection comes to an end

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weak electrolyte

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weather the short-term state of the atmosphere, including temperature, humidity, precipitation, wind, and visibility

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weather

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weather forecast a forecast characterizing the state of the atmosphere at a given time

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weather forecast

Front 29

weathering the natural process by which atmospheric and environmental agents, such as wind, rain, and temperature changes, disintegrate and decompose rocks

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weathering

Front 30

wedge a simple machine that is made up of two inclined planes and that moves; often used for cutting

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wedge

Front 31

weight a measure of the gravitational force exerted on an object; its value can change with the location of the object in the universe

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weight

Front 32

well a hole that is dug below the water table and that fills with groundwater

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well

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westerliesprevailing winds that blow from west to east between 30° and 60° latitude in both hemispheres

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westerlies

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wetland an area of land that is periodically underwater or whose soil contains a great deal of moisture

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wetland

Front 35

wheel and axle a simple machine consisting of two circular objects of different sizes; the wheel is the larger of the two circular objects

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wheel and axle

Front 36

white blood cell a type of cell in the blood that destroys bacteria, viruses, and toxic proteins and helps the body develop immunities

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white blood cell

Front 37

whitecap the bubbles in the crest of a breaking wave

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whitecap

Front 38

white dwarf a small, hot, dim star that is the leftover center of an old star

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white dwarf

Front 39

white matter in the brain and spinal cord, the fatty tissue that is composed of the axons of neurons, which are covered by myelin sheaths

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white matter

Front 40

wilderness a region that is not cultivated and that is not inhabited by humans

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wilderness

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wind the movement of air caused by differences in air pressure

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wind

Front 42

wind gap a water-eroded notch in a ridge through which water no longer flows because of changed topography

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wind gap

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wind power the use of a windmill to drive an electric generator

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wind power

Front 44

windsock a cone-shaped piece of fabric used to indicate the direction of the wind

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windsock

Front 45

wind vane an instrument used to determine the direction of the wind

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wind vane

Front 46

winter solstice the beginning of winter

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winter solstice

Front 47

withdrawal the set of symptoms associated with the removal of an addictive drug from the body

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withdrawal

Front 48

wood the hard substance, composed mainly of xylem, found under the bark of the trunks and branches of trees and shrubs

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wood

Front 49

woody tissue in plants, tissue that is formed from several layers of xylem and that is usually concentrated in the center of the stem

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woody tissue

Front 50

work the transfer of energy to a body by the application of a force that causes the body to move in the direction of the force; it is equal to the product of the magnitude of the component of a force along the direction of displacement and the magnitude of the displacement

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work

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worker bee a bee that does not reproduce but that works for the community by collecting food and maintaining the hive

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worker bee

Front 52

work function the minimum energy needed to remove an electron from a metal atom

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work function

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work input the work done on a machine; the product of the input force and the distance through which the force is exerted

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work input

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work-kinetic energy theorem the theorem that states that the change in kinetic energy of a moving particle is equal to the work done by all of the forces acting on the particle

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work-kinetic energy theorem

Front 55

work output the work done by a machine; the product of the output force and the distance through which the force is exerted

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work output