define: air mass
define: cold front
define: continental polar (cp)
define: continental tropical (ct)
define: january 7, 1965
define: prevailing westerlies
define: staionary front
define: anticyclone
define: cyclone
define: front
define: maritime polar (mp)
define: maritime tropical (mt)
define: occluded front
define: warm front
describe: continental air mass
describe: maritime air mass (m)
describe: polar air mass (p)
describe: tropical air mass (t)
how do scientists classify air masses (2 characteristics)
what are the four major types of air masses that influence the w