Why Trains need Rails?
The trains were born on rails and still continue to run on them. This association of trains and rails
is due to the way in which trains evolved. In both the days of horse drawn vehicles and stream
engines the great need was to elimi
Why do we say that water is the enemy of the rocks?
If we follow a stream or river from its source to its mouth we can see that from the very
beginning it is a great enemy of the rocks and soil.
Whether it comes from a glacier or a spring or merely from f