Explanation:

Fly ash is a resourceful material and can be effectively utilized as soil modifier in large quantity and micro fertilizer in converting wasteland (barren land, rocky nature, sandy and water logged soil, highly alkali and acidic soil etc.) into agriculturally productive land. Best thing about fly ash is, that it retains water in ground and helps bacterial actions to take place to cultivate good quality of crops or vegetables.

• Chhonkar, ICAR emeritus scientist, IARI, New Delhi, has said that the use of fly ash in agriculture would play a major role in the second green revolution.
• Fly ash technology has also provided relief to the overstressed resource base of soils being mined for the production of fired-bricks.
• The use of fly ash in building bricks, first popularised in India by the Institute for Solid Waste Research and Ecological Balance (INSWAREB) in Vishakhapatnam, India, is now rapidly gaining acceptance in construction works. The World Bank has now entered into an agreement with INSWAREB to promote this environment friendly technology - a move that would also yield revenue through sale of carbon credits.
• Blending fly ash with concrete can produce a more durable structure, resistant to corrosion as well as water.
• Fly ash often contains pollutants such as heavy metals and organic compounds. Its inhalation has been linked to silicosis and results in TB, asthama and weakening of the lungs.

Hence all statements are correct.