Sounds such as "echo", eccentric, etc. employ either an extra "c", or sometimes an "h" to indicate to the user how to pronounce the word in question.
I thought that this is the way upon which language is usually built, spelling to indicate how to pronounce, and grammar rules to indicate how to make sense to each other what we mean with a minimum of confusion.

Hence, the single "c" is meant to pronounce words like say, "economics" with an "ee" sound, rather than an "e" sound such as in "echo". We don't pronounce that word as "eecho" do we ?

Dear Rachel, I can assure you that I am of most sound mind, as well as educated sufficiently to perceive many things, but I simply do not get what you are referring to with your comment.
"Please explain"

Plus: here's another that gets me:

The frequently used words "ecology" and economy or "economic", pronounced by many as if the words were spelled with double c, e.g. ecconomic etc.

Why this pain to our great language ?
Is it ignorance or do some people introduce these things just to be different ?

Banjo

Reply to EPI:

"I don't find your examples to be following your own rules.":

"You know if that's going to fall?" This is a question asking IF "THAT" is going to fall.
Your sample sentence is, in my humble opinion, grammatically correct, but seems to point to something grammatically inappropriate. "that" in this sentence refers to some item which is, or is not going to fall, rather than the grammatical "that" used incorrectly to mean WHETHER or NOT, or, IF.

To clarify for you:
"Do you know IF that's (item or object) going to fall ?" Question, compare with:
"Do you know THAT that's (item or object) going to fall ? - implies a certainty.

Repeat mention of radio personality:
“I don’t know THAT it was cleaned much…” (from a radio personality this very evening)
(He was was referring to "it" being a shirt, and was wondering whether of not the shirt in question had been cleaned much, if at all, over the last 3 weeks while it had been in use)