Can an old river ever go back to a youthful river?

Study the image of this rock.which characteristic best supports its formation from sedimentary processes? it has many layers.it is coarse-grained.its grain shape is round.its texture is non-banded.

What is thought to have caused the mass extinction at the end of the cretaceous period?

Penelope studies how the structure and function of the nervous system is related to behavior. she is a psychologist