3/13/2024 0 Comments Dusk definition scienceThe scattering occurs most in shorter wavelengths meaning that since the light carries far more blue light than violet (since it is scattered), the sky appears blue. If the particle is bigger than the wavelength (such as dust particles), the light is scattered evenly, but primarily forward, and all of the colors in the visible spectrum are scattered equally in contrast with the previous two where blue was scattered more than longer wavelengths. If the particle is roughly equal in size to the wavelength (such as smoke particles), the scattering is less pronounced. If the particle is smaller than the wavelength (such as nitrogen and oxygen molecules), the light is scattered in all directions, known as Rayleigh Scattering which causes shadows on sunny days to have a cooler tone. These effects on the light will be determined by how big the particle is to the wavelength. While this radiation travels consistently through the imperfect vacuum of space, molecules will affect it such as when it passes through our atmosphere, scattering the light in random directions. The Sun releases radiation of varying wavelengths across the electromagnetic spectrum from longer wavelengths including radio, microwaves and infrared to our visible spectrum starting with red and moving through to violet (ROYGBIV) as well as shorter wavelengths including ultraviolet, x-rays, and gamma rays. When discussing light, what we see is only one section of the radiation emitted. There are actually three stages of dusk that occur at the end of the three phases of evening twilight: While dusk colloquially means the transition from day to night or even broadly as the evening twilight hours, it has a precise scientific definition related to the solar elevation level, or where the Sun is in the sky in relation to the horizon. The process occurs in reverse in the evening from day to civil to nautical to astronomical and finally to night. In the morning we transition from Night to Astronomical twilight to Nautical Twilight to Civil Twilight with a dawn starting each phase and a dusk ending each. These occur in the morning and the evening in three separate phases. In general, we have dawn, dusk, and twilight to indicate the times when the Sun enters a new phase, throughout the phase, and at the end of a phase respectively. Outside of sunrise and sunset, what are these moments of transition? However, the transition between the two is not instantaneous, meaning that we have times when the light from the Sun is fading or rising. The Sun provides us with light creating the dichotomy of light and day. 10% of marine snow sinks even deeper, which is important in helping maintain atmospheric carbon dioxide levels lower than they would otherwise be.As the Earth rotates around on its axis, the Sun appears to rise in the east and set in the west. Small creatures such as copepods actively feed on marine snow, meaning 90% is recycled within the Twilight Zone. The deeper it gets the longer it stays away from the atmosphere. Marine snow sinks in the ocean, taking large amounts of carbon with it. Many animals in the twilight zone commute up to the surface at night, and back down to the depths of the Twilight zone to respire during the day, transporting carbon dioxide away from the atmosphere and storing it deep in the ocean.Īll the growth and feeding in the surface ocean creates a huge amount of debris from dead creatures and the waste products of living ones, known as marine snow. Phytoplankton are a vital part of the ocean food chain, creating huge amounts of new plant material each year – as much as all land plants combined, including rainforests! This material is eaten by tiny creatures such as copepods, which in turn are eaten by bigger animals and so on, reaching creatures such as the giant squid and sperm whale. The surface ocean is full of tiny plants called phytoplankton and, like trees and grasses, they use carbon dioxide to grow. The ocean contains more than 50 times more carbon than the atmosphere.
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