Cube Transition Effect

Please excuse a complete noob, but how does one switch from one active desktop (one OS) to another (as seen the back of the retail box)? What are the default keystrokes? I believe I have scoured the manual and the online help and several forums, but I cannot find the keystrokes that switches desktops (I have found the ANIMATION tab in the PREFERENCES).

Thank you in advance.

 

Preferences > Animation

EDIT: Key: alt - enter

 

Great! Thanks! I will give it a try. Of course I just noticed last night that my MBP has two ENTER keys (one by the arrow keys and the RETURN/ENTER key in it's usual place by the quote/apostrophe key).