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Science 9 Review B (2 of 2)

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Across
3.means "Earth as the center," how Aristotle described the solar system
6.using plants ("phyto-") to clean up a mess
8.this is the variable that is changed, to see what happens
11.used in astronomy to identify how many degrees something lies above the horizon (how high it appears in the sky)
12.things (like chemicals or light) scattering in various directions
14.very important for aquatic life should be above 5ppm in order to sustain life for most aquatic species (2 words)
16.unit used to measure current, "amps" for short
18.these kinds of fuels include coal, oil, and natural gas
20.useful energy output divided by total energy input (usually as a percent)
22.transforms heat/thermal energy into electricity
24.presence of these is often used as a biological indicator of water quality; an animal lacking a backbone
26.the path of a planet around a star, or of a moon around a planet
27.one of these units represents the distance from the Sun to the Earth
28.these kinds of telescopes can be used day or night, uses radio waves instead of visible light
29.group of stars that form a recognizable pattern
33.using electrical current to break a compound apart
36.object so massive that even light cannot escape the gravitational pull (two words)
37.after our Sun gets very old, and cannot be a red giant any more, it will become this (two words)
39.the ability to do work
40.type of diagram used to illustrate an electrical circuit
42.lethal dose 50; the amount of a substance that causes 50% of a test group to die with a single dose
44.there is lots of it cluttering up space and it moves very fast so is dangerous to space craft (two words)
45.V = IxR (two words)
47.millions or billions of stars grouped together, held together by gravity
48.this is what our Sun will become when it gets much older (two words)
49.gas and dust clouds that form stars
Down
1.not the same as a planet but it does orbit the sun; made of dust and ice
2.increase in concentration of a chemical as it moves up the food chain (e.g. the reason you should not eat too much tuna or shark meat)
4.this kind of variable is held the same for each trial, it is called a "control"
5.abbreviation of "parts per million"
7.this is what happens to energy when it changes form, like chemical to thermal
9.allowing space junk to accumulate in outer space raises concerns of this type
10.the distance it takes light to travel in one year (two words)
13.rockets use chemicals for this
15.this is what you have to multiply by if you are converting from volts to millivolts, or any unit to "milli-" units (two words)
17.reducing the concentration of a solute in solution, usually by adding water
19.ours has eight planets orbiting around the Sun (two words)
21.tiny component that works like a switch in a tiny circuit (microcircuit)
23.these types of telescope use visible light, make good clear pictures but can only be used in daytime in good weather
25.SO2; major air pollutant that forms smog and acid rain (two words)
30.this is the variable that we watch to see what happens, when we change or manipulate something else
31.this effect has to do with certain gases, like carbon dioxide, trapping heat in the Earth's atmosphere
32.the name of the galaxy that our Sun and solar system belong to (two words)
34.the Sun is called a "main sequence" one of these
35.name of a famous rock band, taken from electricity: "alternating current -- direct current"
38.variable resistor, like a dimmer switch
41.the Sun is mostly made of this element, and converts it to helium by nuclear fusion
43.this effect refers to the apparent change in frequency of a wave as the observer and wave source are moving (e.g. how a siren changes pitch as it passes you)
46.testing on animals raises concerns and questions of this type

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