a
solid accumulation of
old, inactive
energy suspended in
space and
time. A
ridge is generated by opposing
energy flows which
hit one another and continues to exist long after the
energy flows have ceased.
—PDC Volume 5 Approved Glossary, —PDC Volume 4 Approved Glossary, —PDC Volume 6 Approved Glossary, —PDC Volume 1 Approved Glossary, —PDC 2 Approved Glossary