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.
After the cold air mass passes, the rainstops. Dry, clear cool or cold weather follows.A warm front is when a warm air mass pushes into a cold air mass.Warm air is less dense than cold air. The lighter warm air slides upand over the cold air. High cirrus clouds form first as rising watervapor condenses.