To see the difference between eras over time is the purpose of a geological timeline.
Geological seam
A geological disaster is when the structure of the earth changes.
Periods are subdivisions of geological eras.
a break in the geological record is a disconformity
A geological disaster occurs when natural geological processes impact on our activities, either through loss of life or injury, or through economic loss. A geological hazard is a potential disaster.
The most recent Ice Age
You look at the ground.
the timeline can let us remember what happen when the things happen in BC or CE
It lists the items to be covered and often establishes a timeline and order.
The purpose of a timeline is to help us locate or pinpoint specific events within history.
A timeline helps readers visualize the sequence of events in a story or historical context. It provides context, helps track important dates and events, and makes it easier to understand the chronology of a topic.
In the geological column , scientists have learned that rocks are stacked in layers. The oldest fossils are located in the deepest layers, a vertical timeline.
geological
Mountains don't have a "purpose". They're the results of millions of years of geological interactions between tectonic plates. A mountain can be used as a natural border but that's not the definition of the word "purpose".
The purpose of making jokes, about any subject, is to amuse and entertain.
Making a timeline of major Vietnam War battles [A{EX]
to show viewers the timeline and effects of the storm over several days