Question

in which two places is aggregate generally found?
○ floodplains and alluvial fans
○ alluvial fans and mines
○ mines and beneath the topsoil
○ beneath the topsoil and above the topsoil

Explanation:

Aggregate is a collection of particles. Alluvial fans are formed by sediment deposition from flowing water, and floodplains are areas adjacent to rivers that get sediment deposits. Both can have aggregate. Mines are for extracting specific minerals (not general aggregate location as much as natural sediment - deposit areas). "Beneath the topsoil and above the topsoil" is too vague. "Alluvial fans and mines" - mines are not typical main places for general aggregate.

Answer:

floodplains and alluvial fans