This is my first question. So please go easy on me if possible.
I can't understand the difference between 'for' and 'over' in terms of time.
For example, What is this difference: 'The birth rate has been increasing over ten years', and 'The birth rate has been increasing for ten years'.
If I can give you another example, what is the difference between 'for centuries' and 'over centuries'.
Maybe this is a very easy question but I can't find out the difference. Please help me.