What causes my brakes to make a grinding noise? on 2008 Honda CR-V

I have a Honda cr-v 2008 and it recently started making a weird grinding noise when I apply the brakes at all but not a high pitched noise. I ha to make a hard brake not too long ago. Any ideas what is wrong or how much it will cost to fix?? I can't take it in for two more days. Thanks!!

Asked by for the 2008 Honda CR-V
How many miles?
If they haven't already been replaced , then it's probably the pads worn down to the metal backing.