Passive participial adjectives are formed from thepast participles of verbs. They describe nouns that are receiving the effects ofan action.
Astrophysicists of the early 20th century, not knowing about nuclearprocesses, computed that a sun powered by chemical burning orgravitational shrinking could shine only for a few million years.
--Robert P. Kirscher, "The Earth's Elements," ScientificAmerican
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