It grows behind the drip line, out of direct sunlight but not in the darkest shadows of the caves.

As a consequence, the r-process runs up along the neutron drip line and highly-unstable neutron-rich nuclei are created.

It has five caves under a vast overhanging rock, carved with a drip line to keep the interiors dry.

Spray, drip line or bubbler emitters are most efficient for watering trees, shrubs, flowers and groundcovers.

A bulldozer was brought in to remove sections of fill beyond the drip line of the shelter.