The crossword solution for the term 'It's All Around Us' is AIR, which stands for Atmospheric Ionizing Radiation. This is a type of radiation that is found in the atmosphere and is composed of particles that are electrically charged. It is created by natural sources such as lightning, cosmic rays, and solar flares, as well as man-made sources such as nuclear power plants and industrial processes. AIR is essential for life on Earth, as it helps to regulate the climate and provides oxygen for living organisms.