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30 Cards in this Set
- Front
- Back
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Solstice
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calendar dates when the days are the longest or shortest
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Equinox
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calendar date when day and night are same length
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Fault
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weakened narrow zones in tectonic plates
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Gametes
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sex cells produced thru meiosis in males and females - forms zygote
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Troposphere
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the layer of the atmosphere located closest to the Earth's surface in which weather occurs
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Neap Tide
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moon sun and earth are at right angles to each other....not alot of difference between low and high tides!
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Tides
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west coast.... 4 tides per day...2 high and 2 low. High when moon is directly overhead. ?????
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tidal force
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`gravititational force is greater on one side of planet than another EX: moon pulls more strongly on the side of Earth that faces moon vs the side facing away creating the bulge that is high tide...the moon pulls water twd it.
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Earths rotation
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180 degrees every 12 hours...360 in 24 hours
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Spring tide
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moon, earth and sun are in line.... creating higher and lower tides than usual
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stars
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highest surface temp - blue
lowest surface temp - red ( Betelguese) |
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Decomposition of Garbage
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glass- 1,000 years
tin can - 50 years plastic bag - 10 years cig. butt - less than 5 years |
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Karyotype
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tells us how many chromosomes are in a cell...can diagnose Down's Syndrome: extra copy of chromosome 21.
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Chromosome
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humans have 23 pairs : male xy , female xx
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Genotype
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the genetic makeup of an organism
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George Mendel
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1865 - garden peas
gene theories: Dominance Segregation independent assortment |
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North Pole
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Summer : point twd sun - causing sun to appear higher or further N
Winter : points away from sun |
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Stars
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large masses of hydrogen, whichhave been pulled together under the influence of gravity..... w/ sufficient amt of hyd and grav pressure-,fusion is initiated and the star;s interior causes the star to glow with visible light
PARALAX - scientists use to measure distance from earth by noting slight change in positon against the background of more distant stars Blue - Hottest Yellow Red- Coolest |
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Minerals
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most common form of solid material in the earth's crust
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volcanoes
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mt that shoots out magma, which hardens into lava - created when two tectonic plates collide, form a mountain and blow their tops
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Evidence of Tectonic plates
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jigsaw puzzle look to continents, fossil comparisons allong edges of continents ...sugg species similarities/some pt in past same
lrg amt of vol.,seismic and geothermal activity along boundaries compared to sites far from boundaries mts like Himalayas that are still growing |
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Scientic Method :
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educated guess
Begin with Hypothesis -identify relevant variables -identify equip/apparatus to be used to measure and record variables -eliminate or surpress any other factors that could influence measurable variables decide on means of analyzing the data obtained |
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Astronomy .... History
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Aristotle - heavenly bodies affixed to spheres concentric to earth
Ptolemy- mathmatical descript of celestial orbits ... forced to fit complicate observation. Copernicus- Earth NOT the center but revolved around sun annually/ rotated on axis |
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Moon phases
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New moon - moon between sun - we see only dark half..next crescent/quarter/Gibbous ( 3/4) and then full......
Starts all over again...30 days |
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Sun
Photoshpere` |
visible surface...6,000 degrees cent.
Sun spots are somewhat cooler distrubances in photoshpere |
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Nova
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star explosion
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Asteroid
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minor planet or fragment - most of known asteroids are betwn orbits of Jupiter/Mars
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Light year
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distance light travels in one year 6x10 to the 12th
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Milky Way
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spiral galaxy to which our solar system belongs.... galaxies can also be elliptical or irregular
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Electric Current
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flow of electrons
DC : Direct current flows in one direction AC : alternating current - periodically reverses the direction of flow |
