Two Dimensional Arrays (What does this do?)

Code:

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char str[40][40];
    int number = 7;

    for (int i=0;i<number;i++){
        printf("enter %d th string::",i+1);
        scanf("%s",str[i]);
    }

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Above, I have a little snippet of a code that I'm trying to figure out. I don't really understand how to implement 2d arrays in C that well. But, I mostly want to know is how and where the strings are being stored, especially with the code below.

Code:

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for (int i=0;i<number;i++){
        printf("enter %d th string::",i+1);
        scanf("%s",str[i]);
    }

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I know that it's asking the user to enter strings, which will be stored into the 2d array. I just don't understand how it's being stored. Will it be placed in the 1st column or 2nd row or something?

Code:

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#include <stdio.h>

int main(void) {
  int i;
  char s[4][50]={
  {"I love it's gentle warble"},
  {"I love it's gentle flow"},
  {"I love to wind my tongue up"},
  {"and then to let it go"}  //**
  };

 
  for(i=0;i<4;i++)
      printf("%s\n",s[i]);
  //s[i] is used here, as a pointer to each row's first location
  //within the array. This shows the "array in an array" feature
  //of a 2D array, in C.

  return 0;
}

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**Martha Mitchell's high school yearbook quote she identified with. How very true! ;)