Question

which of these facts could you determine by reading the geologic time scale?
how old earth is
the nunber of ears
the lifre f0rkks and the envednts ended mahir fivvisions]

Answer 1

I think you meant to ask which of these you can learn from the Geologic Time Scale. The answer is: all of them — with some limits.

- How old Earth is: yes. The time scale gives the start of Earth at about 4.54 billion years ago (ages are given in billions or millions of years, rounded to current best estimates).
- The number of eras: yes. The scale lists the hierarchical subdivisions (eons → eras → periods → epochs). For example, the Phanerozoic Eon is divided into three eras (Paleozoic, Mesozoic, Cenozoic). How many “eras” you count depends on which hierarchical level you mean (e.g., there are multiple eras within each eon).
- The life forms and the events that ended major divisions: yes. The time scale names characteristic life-forms for intervals (e.g., dominance of trilobites in much of the Paleozoic, dinosaurs in the Mesozoic) and marks major events (e.g., the end-Permian and end-Cretaceous mass extinctions) that define many boundaries.

Caveats: the ages are approximate (based on radiometric dating), and the time scale summarizes major events and typical life forms rather than giving detailed narratives or every local event.