An asteroid belt may show a transition.Logical formLearned from1 sentences. Asteroids may originated in an asteroid belt.Logical formLearned from1 sentences. A period may be named for asteroid impacts.Logical formLearned from1 sentences. Events may predate an asteroid impact.Logical formLearned from1 sentences. Stresses may be caused by an asteroid impact.Logical formLearned from1 sentences.