In Chaco Canyon, Hastings was involved in measurement studies of Threatening Rock, before it fell, jumping onto the rock twice a day to determine the effect of temperature on the movement of the rock.
(Hastings; was involved; in measurement studies of Threatening Rock; T:before it fell, jumping onto the rock twice a day; L:In Chaco Canyon) (it; fell; ) (it; jumping; onto the rock; T:twice a day; to determine the effect of temperature on the movement of the rock)
Hastings it it
was involved fell jumping
in measurement studies of Threatening Rock T:before it fell, jumping onto the rock twice a day L:In Chaco Canyon
onto the rock T:twice a day to determine the effect of temperature on the movement of the rock