Mid Tem Review

• Remember seasons are caused by the Earth's tilt NOT how far the Earth is from the Sun. In the diagram the first day of winter in the northern hemisphere would be on the far left- northern hemisphere is tilted away from the Sun.

• Blue shift/red shift- red shift is evidence of an expanding universe where a blue shift would indicate a contracting universe.
• eclipses- review diagrams, lunar eclipse ( Sun-Earth-Moon), solar eclipse (Sun-Moon-Earth).
• review contour maps
• amplitude- for a light wave this is brightness, for sound loudness
• wave speed= frequency X wavelength
• Doppler effect/shift
• mass- does not depend on gravity, mass is a property of the object
• weight- depends on distance from the center of gravity