NEW YORK—After nearly nine years, life is returning to ground
zero in a tangible way.  Crews Saturday began planting 16 swamp
white oaks at the World Trade Center site. They are the first of
nearly 400 trees to be planted around the 8-acre memorial to the
nearly 2,800 people who were killed when terrorists attacked the
twin towers on Sept. 11, 2001.  The trees will shade a
cobblestone plaza surrounding two pools built on the footprints
of the destroyed towers.    Worker Jay Martino looks up at one
of the first Swamp White Oak trees planted around the Memorial
Plaza. Getty Images   The plaza will essentially become a
rooftop garden, covering the museum commemorating the 2001
attacks, commuter train platforms and a parking garage that are
being built as far as 70 feet below ground.   The trees come
from New York, Pennsylvania and Washington, D.C. the places
where the attacks hit. They were about 25 feet tall when first
planted and are expected to soar to 60 to 80 feet high.