গুরুত্বপূর্ন লাইন ••••••••••••••••••••

●Isobar= line connecting points of same atmospheric pressure

●Isobath --line connecting points of equal underwater depth

●Isobront --line connecting points of simultaneous storm development

■Isochasm-- line connecting points of equal frequency of aurorae

■isocheim-- line connecting points of same average winter temp

■isodrosotherm--- line connecting points of equal dew point

■Isodynamic--line connecting points of equal magnetic intensity

■Isogam-- line connecting points of equal acceleration due to gravity

☆Isogen line ---connecting points of equal birthrates

☆Isohaline-- line connecting points of equal salinity

☆Isohel-- line connecting points of equal sunlight

☆Isohyet--- line connecting points of equal rainfall

☆Isokeraunic --line connecting points of equal occurrence of thunderstorms

☆Isonephelic-- line connecting points of equal cloud cover

☆ isopycnic-- line connecting points of equal density

☆ isorithm-- line connecting points of equal population density

☆Isoseismal-- line connecting points of same earthquake intensity

☆Isotac-- line joining points where the ice melts at the same time of year

☆isotach--line connecting points of the same wind speed

☆ isotherm--line connecting points of equal temperature

☆Contour-line connecting same elevation