Answer:
Cast fossils occur when mold fossils are filled in with minerals that harden over time, creating a fossilized replica of the original organism. Water seeps through the rock surrounding the mold fossil, leaving behind minerals which fill the mold. Any mold fossil can potentially form a cast mold.
Explanation:
Geography Mesopotamians changed their environment to improve life. Semiarid climate—hot summers, less than 10 inches of annual rainfall. Crops grew in this dry region because of rivers, fertile soil - many farming villages across southern Mesopotamia
