Spanish is the official language of 9 out of 13 nations in South America since great majority of people who lived there speak Spanish. This is also because of the influence of the Spaniard colonists way back then. I hope this answer helps.
Because crop 'waste' is waste only because you can't sell it or eat it.
Unlike other forms of waste, it's not toxic and it's not a pollutant. The
'wasted' part of the crop is intentionally plowed back into the ground in
many cases. It returns nutrients to the soil that were extracted to grow the
crop, and thus serves to partially replenish the soil for the next year's crop.
Answer:
Conventional sources of energy is also called non-renewable sources of energy while non conventional sources of energy is called renewable sources of energy.
An example of conventional energy is coal, crude oil and natural gas. The advantage is the availability and affordability. The disadvantage is the level of air pollutants such as CO2 and CO it releases to the atmosphere which is harmful as it poses a risk of air borne illnesses.
An example of non conventional energy is the sun, wind , water etc. The advantage is that it reduces the risk of air pollution and keeps the environment clean as no toxic substances are being released into the atmosphere when used. The disadvantage is they are expensive and aren’t available all year round.