The major difference between compost and green manure lies in their composition. While green manure is made from animal-based waste products such as urine and feces. Adding compost to the soil enriches the soil with organic matter while green manure increases the nitrogen level of the soil.
1- Alcoholic fermentation process accomplished by yeast
2- Due to oxidation.
3- Milk contains a sugar called lactose, it also contains harmless bacteria called lactobacillus, which uses lactose for energy and creates lactic acid as by-product. It is the lactic acid which makes milk taste sour
Silicates is the answer to this.
