notes from september 25

map scale-->
- level of detail and amount
- written scale: example 1 inch= 1 mile
- graphic scale: usually consists of a marked bar line

scientific method-->
- four types of distortion:
1. shape of an area can be distorted
2. distance between points may become increased or decreased
3. relative size of different areas can be altered
4. direction between points can be distorted

earths spherical shape causes distortion when drawing it on a flat piece of paper 

geographic grid
a system of imaginary areas drawn in a grid pattern on earths surface

--> meridians are arcs drawn between the north and south poles. each is numbered, according to a system that is known as longitude. range from 0 degrees to 180 degrees east or west longitude

--> parallels are arcs drawn parallel to the equator and at right angles to meridians. each is numbered according to a system= latitude; range from 0 degrees to 90 degrees north or south of the equator

--> points on earths surface can be communicated by referring points of longitude and latitude intersections, example is denver, colorado's location is 40 north latitude and 105 west longitude

--> further accuracy can be achieved by dividing each degree onto 60 minutes and minutes into 60 seconds. example is denver, colorado's state capitol building is 39 42' 2" north latitude

telling time 

--> earth as a sphere is divided into 360 degrees of longitude- divide 360 degrees by the twenty four diffident time zones ( meaning one for each hour of the day)

--> greenwich mean time (GMT) is...
located at the prime meridian( 0 degrees longitude) and passes through royal observatory at                         greenwich (which is located in england) master reference time for all points on earth