Isolines

which way do isolines point when going over a river or a stream

they point the opposite way

index contour line

a heavy dark line on a contour map with an exact elevation

gradient

a slope

contour lines

lines that connect points of equal elevation

topographic map

shows surface features of an area such as mountains, valleys, plains, and plateaus by using contour lines to show changes in elevation

isoline interval

the value of the spacing between to consecutive isolines

isobars

Lines joining places on the map that have the same air pressure

gradient formula

change in field value/distance

gentle slope

flat area; isolines are far apart

elevation

height above sea level

steep slope

isolines are closer together

isotherm

line on a map connecting points equal temperature values

Isolines

lines on a map that connect data points of equal value