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.
The names of the air masses hold clues as to where they originated (and hence the weather they will bring). TROPICAL air masses will bring warm weather and POLAR / ARCTIC will bring cold. CONTINENTAL air masses have travelled over land, and will therefore bring dry weather (as they haven't picked up much water on the way). MARITIME air masses have travelled over the sea, so will bring wet weather.