The smoothness or roundness of the rock would attest to or record the energy interaction with the sand and water;
(The smoothness or roundness of the rock; would attest; to) (The smoothness or roundness of the rock; record; the energy interaction with the sand and water)
The smoothness or roundness of the rock The smoothness or roundness of the rock
would attest record
to
the energy interaction with the sand and water