Answer: e. microscopic spherules and macroscopic meteor debris.
Explanation: Cosmogenous sediment is obtained from extraterrestrial sources, and it exists in two primary forms which are microscopic spherules and larger meteor debris. Microscopic spherules consists mostly of silica or iron and nickel, and are thought to be ejected. Macroscopic meteor debris is obtained from collisions of meteorites with Earth. These collisions release particles into the atmosphere these eventually settle back down to Earth and contribute to the sediments.
