Points to Remember. 1  Marijuana refers to the dried leaves, flowers, stems, and seeds from the hemp plant, Cannabis sativa. 2  The plant contains the mind-altering chemical delta-9-tetrahydrocannabinol (THC) and other related compounds. 3  People use marijuana by smoking, eating, drinking, and inhaling it.
A cold front is symbolized on a weather map as a line with triangles. The triangles can be thought of as icicles. Cold fronts are often coloured blue. The presence of a cold front means that cold air is advancing and pushing underneath warmer air.
Follow this link to see a very nice and complete table of the weather associated with a warm front passage. Cold Fronts A cold front occurs when a mass of cold air advances into a region of warmer air. On weather maps, cold fronts are shown as blue lines with triangles pointing in the direction of the motion of the cold air mass: