Please help me for a science test.

Weathering

Explanation:

Soils develop because of the weathering  materials on Earth's surface, including the  breakup of rocks, and the weathering of minerals. Soil development is facilitated by the downward percolation of water.

when a reversible reaction is occurring in both directions at the same rate; the products and reactants do not change in concentration. a chemical reaction where the compound is broken into its constituent parts.

image result for how many calories of energy will 20 grams of carbohydrates provide in one gram provides 4 calories

consuming the right balance of protein, carbohydrates and fat can you maintain a healthy weight and optimize your energy levels. protein and carbohydrates both contain 4 calories per gram, while fat provides 9 calories per gram.