Final answer:
Ash columns and fall can contain different elements depending on the source, such as volcanic ash containing fragments of rocks, minerals, and volcanic glass. Ash from burning waste may contain elements from the original waste, while in stars, 'ash' refers to accumulated helium and heavier elements in the core after burning hydrogen.
Step-by-step explanation:
Ash columns and fall can contain various elements depending on the source of the ash. Volcanic ash, for example, consists of fragments of rocks, minerals, and volcanic glass created during volcanic eruptions and measuring less than 2 mm in diameter. Ash from the burning of waste can contain elements present in the original waste, and if clean enough, it can be recycled for various purposes. In the case of stars, the term 'ash' refers to the accumulated helium and heavier elements left in the star's core after the nuclear burning of hydrogen during the main-sequence stage.