Earth Science Unit 1 ws地球科学 WS 1单元.k12.ny.us.pptVIP

Fields and Isolines !!!! We’re going to learn about Isolines…isn’t that awesome??? Whatever, just be quiet and learn. Fields – WRITE THIS DOWN in your notes sheet!! Field – a region of space in which there is a MEASUREABLE quantity of a given property at every point Examples: Temperature, Pressure, Elevation, etc. The strength of a field varies (Ex. Whoever smelt it..) The farther away from the source, the weaker the field Fields can be MAPPED by placing measurements on paper and connecting locations with EQUAL readings with figures called ISOLINES!!! Isolines What the heck IS an isoline, anyway? An isoline is a line connecting points of equal value. Examples of isolines: Isotherms: points of equal temperature Isobar: points of equal barometric (air) pressure Contour: points of equal altitude Concentration of chemicals Anything else you can get a value for. (The weather channel loves isolines!) Rules for drawing them! How do you do it? Here’s how!! Once you learn this, you’ll be experts. 1. Isolines connect points of equal value. ?15 ?5 ?5 ?15 ?10 ?10 ?10 ?10 2. Isolines are gentle, curving lines- no sharp corners. ?15 ?5 ?5 ?15 ?10 ?10 ?10 ?10 3. Isolines should always form closed curves (loops) even though the map might only show part of it. So, at times you may have to extend a line to the edge of the map! 4. Isolines NEVER cross- this would mean that one point has two different values. Ex: one spot has two temperatures? That’s whack! 20° 30 ° 40 ° 50 ° 60 ° ?X ?Y ?Z 5. Isolines usually are parallel. (They have a parallel trend, and usually follow the same pattern.) More on Isolines!! 6) Isolines are drawn according to a designated isoline interval On a map, they are called the CONTOUR INTERVAL 7) Isolines should ALWAYS be drawn in pencil It’s easy to make mistakes, so you might have to do some heavy duty erasing. Stop whining. Visualizations of contour lines /~sreynolds/topo_gallery/topo_gallery.htm Use your ESRT to write the equation For Gradient on your