What theory do scientists have for the formation of desert pavement ?

Several theories have been proposed for the formation of desert pavements. A common theory suggests they form through the gradual removal of sand, dust and other fine-grained material by the wind and intermittent rain, leaving the larger fragments behind.

Explanation: scientists have had sever theories as stated in my answer above

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.

any abiotic or biotic factor in an ecosystem that causes a population's size to slow or decrease is a limiting factor.