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55 Cards in this Set

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  • Back
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
warm front the front edge of an advancing warm air mass that replaces colder air with warmer air
warm front
wastewater water that contains wastes from homes or industry
water budget gains, losses, and storage of water in a region; the relationship between evaporation, precipitation, and runoff
water budget
water cycle the continuous movement of water between the atmosphere, the land, and the oceans
water cycle
waterfowl an aquatic bird, such as a duck, goose, or swan
water gap a deep, narrow pass across a ridge, mountain, or other elevated area through which a river or stream flows
water gap
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
water of hydration
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
water pollution
watershed the area of land that is drained by a river system
waterspout a tornado that occurs over a water surface
water table the upper surface of underground water; the upper boundary of the zone of saturation
water table
water vascular system a system of canals filled with a watery fluid that circulates throughout the body of an echinoderm
water vascular system
watt the unit used to express power; equivalent to a joule per second (symbol, W)
wave a periodic disturbance in a solid, liquid, or gas as energy is transmitted through a medium
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
wave-built terrace
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
wave-cut terrace
wave cyclone a cyclone that forms and moves along a front, and that produces a wavelike deformation of the front
wave cyclone
wavelength the distance from any point on a wave to an identical point on the next wave
wave period the time required for identical points on consecutive waves to pass a given point
wave period
wave speedthe speed at which a wave travels through a medium
wave speed
wave velocity the speed and direction at which a wave travels through a medium
wave velocity
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
weak acid an acid that releases few hydrogen ions in aqueous solution
weak acid
weak electrolyte a compound that dissociates only to a small extent in aqueous solution
weak electrolyte
weak electrolytethe time when an animal's dependence on its mother for food (milk) and protection comes to an end
weak electrolyte
weather the short-term state of the atmosphere, including temperature, humidity, precipitation, wind, and visibility
weather forecast a forecast characterizing the state of the atmosphere at a given time
weather forecast
weathering the natural process by which atmospheric and environmental agents, such as wind, rain, and temperature changes, disintegrate and decompose rocks
wedge a simple machine that is made up of two inclined planes and that moves; often used for cutting
weight a measure of the gravitational force exerted on an object; its value can change with the location of the object in the universe
well a hole that is dug below the water table and that fills with groundwater
westerliesprevailing winds that blow from west to east between 30° and 60° latitude in both hemispheres
wetland an area of land that is periodically underwater or whose soil contains a great deal of moisture
wheel and axle a simple machine consisting of two circular objects of different sizes; the wheel is the larger of the two circular objects
wheel and axle
white blood cell a type of cell in the blood that destroys bacteria, viruses, and toxic proteins and helps the body develop immunities
white blood cell
whitecap the bubbles in the crest of a breaking wave
white dwarf a small, hot, dim star that is the leftover center of an old star
white dwarf
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
white matter
wilderness a region that is not cultivated and that is not inhabited by humans
wind the movement of air caused by differences in air pressure
wind gap a water-eroded notch in a ridge through which water no longer flows because of changed topography
wind gap
wind power the use of a windmill to drive an electric generator
wind power
windsock a cone-shaped piece of fabric used to indicate the direction of the wind
wind vane an instrument used to determine the direction of the wind
wind vane
winter solstice the beginning of winter
winter solstice
withdrawal the set of symptoms associated with the removal of an addictive drug from the body
wood the hard substance, composed mainly of xylem, found under the bark of the trunks and branches of trees and shrubs
woody tissue in plants, tissue that is formed from several layers of xylem and that is usually concentrated in the center of the stem
woody tissue
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
worker bee a bee that does not reproduce but that works for the community by collecting food and maintaining the hive
worker bee
work function the minimum energy needed to remove an electron from a metal atom
work function
work input the work done on a machine; the product of the input force and the distance through which the force is exerted
work input
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
work-kinetic energy theorem
work output the work done by a machine; the product of the output force and the distance through which the force is exerted
work output