To determine which statement is not a valid conclusion about the changes reflected in the images from A to E, let's analyze each option:
A. The area was covered with water during B and C; layers D and E are not.
This statement suggests a chronological change in water coverage, which could logically follow from geological processes. This statement seems valid.
B. There was a geological event in image D causing the layers to tilt and life.
This statement indicates a geological event affecting the layers. If the images show evidence of tilting, this could be a valid conclusion.
C. Weathering and erosion helped to cover the dinosaur with many layers of sediment.
This statement implies a process of sedimentation that is reasonable over geological time, as layers can accumulate through weathering and erosion. This also seems valid.
D. The climate change from tropical when the dinosaur lived to arctic after its death.
This statement suggests a significant shift in climate. While climate can change due to various long-term geological and astronomical processes, such a drastic shift from tropical to arctic would typically not occur rapidly or directly after the death of a dinosaur, making this statement less likely to be valid based on the information provided.
Therefore, the statement that is NOT a valid conclusion about the changes is D: The climate change from tropical when the dinosaur lived to arctic after its death.