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Subject: t Author: t [ Next Thread | Previous Thread | Next Message | Previous Message ] Date Posted: 21:52:27 01/27/04 Tue MASS = the amount of material an object is made up of (it never changes if the object does not change) WEIGHT = a measure of the gravitational force exerted on an object (if changes depending on the planet you are on) METRIC = unit for weight, use to measure force ENGLISH UNIT = pounds, etc. WAVES = a disturbance that transfers energy from place to place. The material through which a wave travels is called a medium, ex: air, water slinky. 3 types of waves: 1)transverse- 2)longitudinal- „²„³ |||| | | |||| | | |||| THE DOPPLER EFFECT = low frequency behind high frequency in front. REFLECTION = when a wave hits a surface through which it can not pass, it bounces back. REFRACTION = when a wave moves from one medium to another it changes speed, which causes it to bond. DIFFRACTION = when a wave passes a barrier or moves through a hole in a barrier it bends and spreads out. INTERFERENCE = when 2 or more waves meet. 1)CONSTRUCTIVE INTERFERENCE ¡V when 2 waves combine to make a bigger amplitude wave „²„³ 2)DESTRUCTIVE ¡V 2 waves. EARTHQUAKE WAVES: P-waves = longitudinal(up/down), S- waves = transverse(side/side). BELTS OF EARTHQUAKE = 1)ring of fire 2)mediterranean-himalayan mountain range 3)mid-ocean ridge. 4) LAYERS OF THE EARTH = 1)inner core ¡V metal sphere ; 1,512 miles across, iron + nickel 2)outer core ¡V thick liquid, mostly iron. 3)mantle ¡V thick bendable layer, iron + magnesium, 1,789 miles thick. 4)crust ¡V oceanic ¡V basalt rock 5-10km, continental ¡V granite-like rock that is less dense but thicker. ASTHENOSPHERE ¡V upper mantle, bendable. LITHOSPHERE ¡V top mantle + crust, rigid. ALFRED WEGENER in 1912 came up with the theory of Continental Drift. SEA FLOOR SPREADING (DIVERGENT BOUNDARIES) evidence: 1)long underwater Mountain Range ¡§ Ridge¡¨, deep valley in the middle. 2) youngest rocks were closets to the ridge. 3)magnetic patterns-earths magnetic field causes lava crystals to line up facing north. VOLCANO = magma ¡V is molten rock that moves up towards the earths surface. The magma that reaches the surface is called Lava and creates a volcano. [ Next Thread | Previous Thread | Next Message | Previous Message ]