Android : When does Android system launches the intent in startActivityForResult?

I want to know when exactly does the new activity gets launched (or when is the intent really sent by system). I created 2 activities for this purpose. On Activity1, I entered

Log.d("Test", "Activity 2 is about to be created");
startActivityForResult(getIntentForLaunchingActivity2(), 5);
Log.d("Test", "startActivityForResult for Activity2 has been called");

In Activity2's onCreate method I added the following debug statement.

Log.d("Test", "Started Activity 2");

I observed the following sequence of statements

Activity 2 is about to be created
startActivityForResult for Activity2 has been called
Started Activity 2

I want to know if there is any sequence. Is this sequence something Android system level detail or the API's contract? Pardon me if this is really trivial. I have just started in the Android world and wanted to gain more accurate information. Thanks for help in advance.