Which tribes made up the mongolic tribes of the xiongnu empire?
xianbei
indo aryan
tibetan
luandi
lan
siberian-taiga
ugaritic

Select the correct answer. after months of heavy rains, a farmer noticed a steady drop in crop production. upon testing the farmland, it was found the soil was severely lacking nutrients. which of the following explains the loss of nutrients from the soil? a. drought b. drainage basin c. leaching d. water shedding