Questions on Process Map - memory-management

Question

Here I am running two instance of same program in two different terminals. The process map of them are
In first terminal -
vikram#vikram-Studio-XPS-1645:~$ pmap 6548
6548: ./a.out
0000000000400000 4K r-x-- /home/vikram/a.out
0000000000600000 4K r---- /home/vikram/a.out
0000000000601000 4K rw--- /home/vikram/a.out
00007f90f2406000 1576K r-x-- /lib/x86_64-linux-gnu/libc-2.13.so
00007f90f2590000 2044K ----- /lib/x86_64-linux-gnu/libc-2.13.so
00007f90f278f000 16K r---- /lib/x86_64-linux-gnu/libc-2.13.so
00007f90f2793000 4K rw--- /lib/x86_64-linux-gnu/libc-2.13.so
00007f90f2794000 24K rw--- [ anon ]
00007f90f279a000 132K r-x-- /lib/x86_64-linux-gnu/ld-2.13.so
00007f90f2992000 12K rw--- [ anon ]
00007f90f29b7000 12K rw--- [ anon ]
00007f90f29ba000 4K r---- /lib/x86_64-linux-gnu/ld-2.13.so
00007f90f29bb000 8K rw--- /lib/x86_64-linux-gnu/ld-2.13.so
00007fffb2333000 132K rw--- [ stack ]
00007fffb23ff000 4K r-x-- [ anon ]
ffffffffff600000 4K r-x-- [ anon ]
total 3984K
In second terminal -
vikram#vikram-Studio-XPS-1645:~$ pmap 6676
6676: ./a.out
0000000000400000 4K r-x-- /home/vikram/a.out
0000000000600000 4K r---- /home/vikram/a.out
0000000000601000 4K rw--- /home/vikram/a.out
00007f3b0ad37000 1576K r-x-- /lib/x86_64-linux-gnu/libc-2.13.so
00007f3b0aec1000 2044K ----- /lib/x86_64-linux-gnu/libc-2.13.so
00007f3b0b0c0000 16K r---- /lib/x86_64-linux-gnu/libc-2.13.so
00007f3b0b0c4000 4K rw--- /lib/x86_64-linux-gnu/libc-2.13.so
00007f3b0b0c5000 24K rw--- [ anon ]
00007f3b0b0cb000 132K r-x-- /lib/x86_64-linux-gnu/ld-2.13.so
00007f3b0b2c3000 12K rw--- [ anon ]
00007f3b0b2e8000 12K rw--- [ anon ]
00007f3b0b2eb000 4K r---- /lib/x86_64-linux-gnu/ld-2.13.so
00007f3b0b2ec000 8K rw--- /lib/x86_64-linux-gnu/ld-2.13.so
00007fffb1153000 132K rw--- [ stack ]
00007fffb11c7000 4K r-x-- [ anon ]
ffffffffff600000 4K r-x-- [ anon ]
total 3984K
My questions are -
"/lib/x86_64-linux-gnu/ld-2.13.so" this library has two different addresses in terminal 1 and 2 ( 00007f90f279a000 and 00007f3b0b0cb000 ). Is it means this library is loaded 2 times in main memory ?
Assuming a.out is binary of simple Hello_World.c program
#include<stdio.h>
void main()
{ printf("Hello World");}
then which part of a.out has r & w permission ?
In simple words which part of source " 0000000000601000 4K rw--- /home/vikram/a.out " this segment is suppose to contain ?
Why anon is not continuous like other segments ?
What " 00007f90f2590000 2044K ----- /lib/x86_64-linux-gnu/libc-2.13.so " this segment suppose to contain .... because it doesn't have read, write, execute permissions.

Answer 1

1) Dynamic loader or the ld is the first to be executed after OS starts the process. Those address are virtual addresses of the process, but would ultimately map to same physical memory.
2) data segment of the process. (both initialized data and BSS)
3) Its used various purposes such as heap, mmap and any sharedmemory etc.
4) AFAIK its internal private data.