Earth Science: Unit 1 - mrsciguy

Earth Science: Unit 1 - mrsciguy

Isolines 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 Isolines: 1. Isolines connect points of equal value. 5

5 10 10 10

10 15 15 2. Isolines are gentle, curving

lines- no sharp corners. 5 5 10

10 10 10 15

15 3. Isolines are always closed curves even though the map might only show part of it.

4. Isolines NEVER cross- this would mean that one point has two different values. Ex: one spot has two temperatures? 40

50 30 60 X

20 Z Y

5. Isolines usually are parallel. (They have a parallel trend.) Visualizations of contour lines http:// geology.asu.edu/~sreynolds/topo_gallery/topo_g

allery.htm Gradient Gradient shows how quickly the value changes from one point to another.

v a lu e G r a d ie n t d is t a n c e A steep (high) gradient changes quickly and the isolines are close together.

A gentle (low) gradient changes slowly and the lines are far apart. Steep area Gentle area Making Contours worksheets

Worksheets can be printed from: http://www.rcmurphy.net/Medina%202005/docu ments/Contours123.doc Highlight data

points. Fill in gaps in data.

Connect the dots. Go on to the next

value. Making a Contour Map II Drawing Contour Maps III

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