It could have pros because it may be a better technique, and helps you get more of what you want, but it could also have cons, because it could give back less than what you got with the other technique. This is like if you have a job filing paperwork, and you have a good technique or tool to help you along quickly, but you decide to try something new, and end up being able to get things done faster. However, you might decide to change your techniques again, and you may find that it gets things done much slower. Hope this helps.
India and Pakistan used to be one country up until 1947 - when the Partition of India happened.
Ever since then their relationship has been very problematic - Kashmir is disputed between the two nations, and their relationship can be described as competition (for example they both have nuclear arms and had a kind of unofficial competition over who has more ).
Gasoline, smoke from factories, oil
If surface water does not flow into the oceans, then it will be collected into lakes or wetlands for instance in marshes and swamps. Also, Drainage basins collect surface water and direct it on it gravitationally.
