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76 Cards in this Set
- Front
- Back
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The sun is part of an _______ galaxy.
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spiral
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a range of colors formed when white light passes through a prism is called a _________.
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spectrum
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Both refracting and reflecting telescopes are desighned to what.
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gather and focus visible light
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the chemical composition of a star can be determined using a _________.
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spectograph
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what is a light year?
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the distance light travels in a year.
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parallax is a method used to determine a stars what?
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distance from earth
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the brightness of a star depens on its _______ and _______.
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size and teperature
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the force that tends to pull together the matter in stars is ________.
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gravity
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black holes form from stars that what?
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were 40 times the mass of the sun
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the Milky Way is a what?
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spiral galaxy
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one piece of evidence that supports the Big Bang Theory is tlhe observation that most galaxies are moving were?
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away from one another
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the apparent change in position of an object when viewed from two different places is called _________.
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Parallax
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the model in witch earth is at the center of the system of planets is called the what?
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geocentric system
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the two factors that combine to keep the planets in ordit are __________ and __________.
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gravity and inertia
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the tendency of a moving object to continue moving in a straight line or a stationary object to remain in palce is called ________.
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iertia
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the sun produces energy by what?
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nuclear fussion
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the solar wind in a stream of electrical charged particles produced by the sun's _______.
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corona
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what do all the inner planets have in common?
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they are small and have rocky surfaces
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saturns rings are made up of mostly what?
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chunks of ice and rock
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Uranus is different from the other outer planets because it what?
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rotates on its side
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Pluto is different from the other outer planets because it what?
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is small and has a solid surface
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meteoroids usually come from _______ or ________.
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comets or astroids
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one complete revolution of earth around the sun takes about how long?
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one year
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earth has seasons because what?
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earth's axis is tilted as it moves around the sun
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when the north end of earth's axis is tilted toward the sun, North America will experience what?
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more direct rays and longer days
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because the moon rotates once for every revolution around earth what happens
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younever see the far side of the moon
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from new moon phase to full moon phase you see what?
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an increasing amount of the lighted side of the moon
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it's basic law of phisics that for every force, or action, there is what?
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an equal and opposite force, or action
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putting rockets into space was made possible by the development of what?
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multistage rockets
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geosynchonous satelites above the equater what?
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stay above the same point on earth
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one major use of space stions is to what?
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conduct scientific research
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how large is the moon compared to earth?
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about one fourth the diameter of earth
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the gasses in our atmosphere aside from oxygen and nitrogen make up what percent of dry air?
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1%
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Ozone is what?
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a form of oxygen with three oxygen atoms in each molecule
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water vapor is water in the form of a ________.
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gas
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nearly half of the pollution caused by humans comes from what?
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motor velhicles
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density can be determinded by using what?
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density=mass/volume
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air in the atmosphere has preasure because why?
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air has mass
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the ozone layer in the atmosphere obsorbs what?
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uultraviolet radiation
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because air has mass, it exerts a force per unit area called _____________.
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air preassure
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plants use water to make food in a process called ________.
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photosynthesis
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approximately what percent of earth's water is fresh water?
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3%
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the land area that supplies water to a river system is called a ____________.
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watershed
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the natural deposits theat help keep rivers from flooding are called ______.
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levees
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iceburgs form when what?
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the end of a glacier reaches the coast and breaks off
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a well in wich groundwater rises because of preasure is called a ______________.
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artisian well
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wetlands help control flooding by what?
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absorbing runoff from heavy rains
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many large cities grew up on rivers or coast because people usde water for _____.
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recreation
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waves on the surface of the ocean are mostly caused by ______.
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wind
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the horizontal distance between waves crests is the ________.
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wave length
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tides are caused by what?
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the interaction of earth, the moon, and the sun
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about how often do high tides occur in most places?
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every 12 hours
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what area in the ocean is most likely to have the lowst salenity?
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a bay at the mouth of a big river
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the average salenity of ocean water is what?
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35 parts per thousand
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the most dense ocean water is generally found in the ______.
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deep zone
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as you desend through the water colum, what decreases?
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the pemperature
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in the northern hemesphere, currents curve to the right because of the _____________.
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Coriolis effect
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the force of the sun's and the moon's __________ pulling on earth causes tides.
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gravity
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the PH of water is measured of its __________.
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acidity
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pure water is neutral, meaning it is neather a acid nor a base.Pure water has a PH of________.
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7
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why is chlorine added to drinking water?
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chlorine kills disease-causingmicroorganisms
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a drought is a long period of what?
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less rainfall than normal
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specific sources of polluion that can be identified are called______________.
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point sources
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a type of water pollution that is caused by smoke and exhaustis ____________.
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acid rain
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a pollution often found in road runoff is___________.
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oil
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the addition of any substance to water that has a negative effect on living things is called ________________.
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pollution
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the continuous chain of under water moutains is called the _____________.
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mid-ocean ridge
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a deep canyon in the ocean floor called a ________.
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trench
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benthos are organisms that live were?
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on the ocean floor
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free-swimming animals that can move throughout the water column are called___________.
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nekton
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what organism is an exanple of nekton?
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dolphin
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most of the worlds major ocean fishing areas are located in the_____________.
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neritic zone
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organisms in the deep ocean that produce their own light are called__________.
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biolimnescent
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what is a living resource from the ocean?
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algae
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harvesting fish at a rate faster than they can reproduce is called ______.
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over fishing
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most ocean pollution comes from__________.
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the land
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