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.
As the warm air is forced upward, water vapor condenses into clouds and rain, which can sometimes be heavy along the front. A cold front, noted on weather maps by this symbol, is often characterized by quick changes and steady precipitation, followed by showery precipitation. A WARM FRONT has warm, moist air behind it that rises over the colder air it encounters. Rain may fall behind the front as the warm, rising air condenses. A warm front, noted on weather maps by this symbol, generally has a long frontal boundary -- the area where changes occur. STATIONARY FRONTS occur where warm and cold air meet but neither wins out. Unsettled weather can occur over a wide area near the frontal boundary.