1. The distance covered by the first train between Bombay and Thane in 1853 was approximately 34 km.

2. This train was pulled by three steam engines named Sahib, Sultan and Sindh. The train had 14 coaches and was carrying about 400 people.

1. Humus is found in the topmost layer of soil (A-horizon).

2. Humus is a black or brown colored substance which makes the soil fertile.

3. It is an important source of nutrients for plants, and it helps the soil absorb water and air.

4. There are many ways to promote humus, including-

- Leaving crop residues in the field

- Using livestock manure

- making compost

1. Hematite is an ore of iron. It is commonly found in stones and soil. The largest quantity of iron in the earth is found in the form of hematite.

2. The chemical formula of hematite is Fe2O3. It is a heavy and relatively hard oxide mineral.

  3. Its colour ranges from black to steel or silver-grey, grey to brown or reddish.

4. Hematite is used in the production of iron. It is an important mineral that is found in many countries around the world.

According to the 2011 census, Bihar state has the highest fertility rate in India.

1. According to the 2011 census, India's population was 1,210,193,422 (1.21 billion).