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Learn the skill
Compare the same feature in two descriptions. A change is something different; continuity is something that stays. Different does not automatically mean better or worse.
Worked example
If an old picture shows a wooden bridge and a later picture shows a metal bridge, the material changed. If both cross the same stream, that feature stayed.
Two Invented Descriptions
A fictional school in 1980 has a gray roof and a tree beside it. In 2020, the same school has a red roof and a tree beside it. These classroom examples are not records of a real school.