<em>Scientific method </em>is basically the process for experimentation used for observing– and is in any investigation in which a hypothesis is scientifically tested.
One effect that plentiful harvests had on ancient civilizations of the mainland's river valleys was to help have larger populations and the need to have materials to survive.
Answer: c. disconformity
Explanation:
Disconformity is a type of unconformity between parallel layers of sedimentary rock indicating interruption of sedimentation. It maybe caused by erosion or a period of no deposition. Therefore, on the site above the considerable span of time for which no sedimentary rock layer exists is an example of disconformity.
