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.
Warm Fronts and Cold Fronts - A Brief Explanation as to How Precipitation Varies with Each Type of Front. Warm Front - A warm air mass is overtaking a cold air mass. Since warm air is less dense than cold air, it rises above the retreating cold air. Warm fronts normally have a gradual increase in cloudiness.