Mount Hood's last major eruption occurred in the 1790's not long before Lewis and Clark's expedition to the Pacific Northwest. In the mid-1800's, local residents reported minor explosive activity, but since that time the volcano has been quiet.
Signal Colors and Their Meaning. The colors used in today's signals are green, yellow, red, lunar, and white (remember, we're talking about signals in North America). The color of a signal tells the engineer what he has to do, the location of that color, determines the speed at which he is allowed to do it.We will get to the speed thing in a minute.he colors used in today's signals are green, yellow, red, lunar, and white (remember, we're talking about signals in North America). The color of a signal tells the engineer what he has to do, the location of that color, determines the speed at which he is allowed to do it. We will get to the speed thing in a minute.
Blue Color Psychology and Meaning. Blue is one of the most popular colors. Applying the psychology of color, itâs possible to learn more about the different associations blue has and how we perceive it. Serenity. Blue is a color that suggests peace. Itâs the color of the calm sea and the clear sky, both of which are linked to inner serenity, calm and clarity. Blue was also shown to slow heart rate and breathing, so it can be a good color to aid in meditation or relaxation. Intelligence. Blue is associated with intelligence.