Some Fundamental Questions on Ada????

["Vidanelage Sanath D. Jayasena" <jayasena@cs.uiuc.edu>]

Hello Ada people,

I do not know Ada; I know C, C++, Pascal...
and am a Computer Science student.

Could someone pls give clear/brief answers to the following?
I appreciate it very much.

1. 

1.1 What is a 'module' in an Ada (software) system ?
    Is it equivalent to functions/procedures in Pascal/C
    languages ? 
    (But I heard that Ada has procedures as well.)

1.2 What are 'packages' and 'tasks' ? 
    How are they related/connected to 'modules'/'procedures' ?
   
2. Can several 'procedures' exist in one 'module' ?

3. Can there be inter-module calls (just as we have
   inter-procedure calls in other languages) ?
   If so, are parameters passed ?

4. What about inter-procedure calls ?
   Can they be inter-module or should they
   always be intra-module ?
   

Thank You .....

Sanath Jayasena
jayasena@cs.uiuc.edu