4/10 quiz #1

The geologic time scale is a record of the geologic events and the evolution of life forms as shown in the fossil record.

• True

• False

The first step in developing the geologic time scale was studying rock layers and index fossils worldwide.

• true

• false

Because the time span of Earth's past is so great, geologists use the _____________ time scale to show Earth's history.

• geologic

• eras

• Pre Cambrian

• super fun

Scientists chose where units of geologic time began and ended based on major changes in ___________________ at certain times.

• life forms

• ocean levels

• weather patterns

• Tik Tok dances

The long span of time that begins geologic time is called _____________.

• Precambrian Time

• Mesozoic

• Cenazoic

• a long time ago

The Triassic Period, the Jurassic Period, and the Cretaceous Period occurred in the ___________________ Era.

• Mesozoic

• Precambrian

• Cenozoic

• Instagram

Earth’s most primitive life forms are represented by:

• prokaryotic cells.

• plants.

• fungi.

• tube worms.

Which segment of time is the smallest?

• Eon

• Era

• Period

• Epoch

The most recent era within the Phanerozoic, meaning recent life.

• Mesozoic

• Periods

• Epochs

• Cenozoic

• Paleozoic