Which information can be determined using half lives

Based on the topographic map of mt. st. helens, what is the contour interval of the volcano about height is 2,950 m?

Several bird species feed in a certain species of tree. each bird species feeds in a different part of the tree. which statement is true of these bird species? a. they have adapted to different niches due to competition b. they have a carnivorous relationship with the tree species. c. they have adapted to different niches due to predation d. they have a symbiotic relationship with the tree species.

Why do oceanic plates tend to subduction when colliding with a continental plate