Geologic Time Scale Practice

Front

______________ is the long span of time that begins geologic time.

Back

Precambrian Time

Front

A unit of geologic time that subdivides eras

Back

period

Front

The Triassic Period, the Jurassic Period, and the Cretaceous Period occurred in what era?

Back

Mesozoic

Front

Scientists chose where units of geologic time began on major changes in ______________ at certain times.

Back

life forms

Front

The Earth is believed to be about ______ years old.

Back

4.6 Billion

Front

Relative dating of rock layers tells us that the deeper we dig, _______.

Back

the older the rocks get

Front

Identify the Era:
where dinosaurs thrived

Back

Mesozoic

Front

Identify the Era: First forms of life appeared in this era.

Back

Precambrian

Front

Which answer choice shows the geologic eras in the correct order from earliest to the most recent? Options: paleozoic, precambrian, cambrian, mesozoic, cenozoic, Precambrian, cenozoic, paleozoic, mesozoic, Precambrian, paleozoic, mesozoic, cenozoic, Precambrian, mesozoic, cenozoic, paleozoic

Back

Precambrian, paleozoic, mesozoic, cenozoic

Front

According to the fossil record, when did life first appear on Earth?

Back

3.5-3.8 billion years ago