1. 1. There are two styles of justified setting:
Justified but hyphenated
 is the most preferable choice
A string of aftershocks rattled the US and Mexican
Pacific Coast early Monday, hours after a huge earth-
quake struck northwestern Mexico, killing two people
and rocking building as far away as southern California.
Justified but not hyphenated
 a greater hindrance to reading than hyphenation
A string of aftershocks rattled the US and Mexican Pacific
Coast early Monday, hours after a huge earthquake struck
northwestern Mexico, killing two people and rocking building
as far away as southern California.
2. There are three main types of unjustified / ragged right
Unjustified and unhyphenated
 produces a ragged effect on the right
 looks odd on a page
 irritated the reader
A string of aftershocks rattled the US and Mexican Pacific Coast
early Monday, hours after a huge earthquake struck
northwestern Mexico, killing two people and rocking building
as far away as southern California.
Unjustified but hyphenated
 the ragged right effect is greatly reduced
A string of aftershocks rattled the US and Mexican
Pacific Coast early Monday, hours after a huge earth-
quake struck northwestern Mexico, killing two
people and rocking building as far away as southern
California.
Ragged left
 produces an uneven left-hand margin and even right-hand margin
 is no use for continuous text
 slows reading efficiency
A string of aftershocks rattled the US and Mexican
Pacific Coast early Monday, hours after a
huge earthquake struck northwestern Mexico,
killing two people and rocking building as far away
as southern California.