Geologic Time Framework Practice Test

A science class uses a simplified geologic time framework to organize Earth’s long-term history by order and relative duration (not exact dates). The timeline is divided into three segments whose drawn lengths are not equal, to emphasize that Earth’s history is vast:

• Segment 1: Early Earth history (longest segment)
• Segment 2: Middle Earth history (medium segment)
• Segment 3: Recent Earth history (shortest segment)

Three events are placed in order from left to right on the timeline: (A) first oceans form, (B) many kinds of animals become common in oceans, (C) humans appear.

Based on this framework, which event happened latest in Earth’s history?

A student uses a simplified geologic time framework to organize Earth’s history by order and relative duration. The student underlines a note: segment lengths are not equal.

Timeline: EARLY ———————————————————————————————— MIDDLE ———————— RECENT — Events: • Earth’s crust cools and solidifies (EARLY) • First complex multicellular life becomes common (MIDDLE) • Humans appear (RECENT)

Which claim is the incorrect use of the framework?