Question

Old trains were powered by steam engines. What was most likely needed to produce the steam to power a train?

a. Ice and a furnace to create water.
b. Water and a way to heat the water.
c. Water and very cold chemical to freeze water.
d. Water vapor and a way to cool it to create water.

Answer 1

Steam engine probably needs steam for working, and the easiest way to get it is to heat water. Therefore the answer b. looks as the most credible.

The answer:

b. Water and a way to heat the water.