Gravel in the soil helps crops grow better, since they provide nutrients. Sand however, doesn't impact the crops growth at all.
Answer:
Honestly, I think that all of them are equally important, they all have things about them that make them important and they all play a role in the survival of humanity and other organisms! So if u can put all of them, I think it would be the right answer!
I'm not 100% positive but it is South Korea
Well, Ecuador is a country filled with rainforests, which occur where it rains a lot, the western side of mountain ranges, where storms build up and stall, and it could be during el nino, which means a large abnormal amount of storms in pacific tropical areas.