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.
Stationary fronts prolong bad weather. A cold front is the boundary between cool and warm air when the cool air is replacing the warm air. A warm front is the boundary when the warm air is winning the battle. When the pushing is a standoff, the boundary is known as a stationary front. Stationary fronts often bring several days of cloudy, wet weather that can last a week or more. Since neither the warm air nor the cold air are advancing, the stationary front weather map symbols combine both the cold front and the warm front symbols. Maps show stationary fronts with alternating triangles pointing away from the cold air and half circles pointing away from the warm air. Color maps alternate the cold front blue and warm front red. A weather map's frontal position shows where the boundary touches the Earth.