The main target when controlling the acidity of soils is a. neutralizing the ph b. adding base c. replacing lost cation nutrients d. eliminating humic acids

C

Explanation:

Acidic soils mean they have more of Al3+ and H+ ions which are acid forming cations. These cations make alkaline forming ions unavailable to plants as nutrients. When the pH of the soil is raised, the Al3+, Fe3+, and H+ are neutralized. The ions bind with –OH ions hence releasing the ions in the negatively-charged sites on the hummus to play a role in the nutrient exchange.

as resources become scarce because of population growth, the growth decreases after few years due to lack of resources and food.

explanation:

on disadvantage of hydroelectric power is the cost. another disadvantage of using hydroelectric power is finding a water source powerful enough to harvest hydroelectric power.