Geological Time Objectives

What are the main divisions that make up geological time?

• Eons, Eras, Periods, Epochs

• Continents, Oceans, Mountains, Rivers

• Planets, Stars, Galaxies, Universes

• Atoms, Molecules, Cells, Tissues

The main differences between each of the divisions of geological time are:

• the length of time they cover and the significant events that occurred during them.

• the types of rocks found in each division.

• the climate changes that occurred during each division.

• the types of fossils found in each division.

The divisions of geological time mentioned in the text are:

• Eons, Eras, Periods, Epochs

• Years, Decades, Centuries, Millennia

• Days, Weeks, Months, Years

• Hours, Minutes, Seconds, Milliseconds

Which of the following is not a division of geological time?

• Éons

• Eras

• Periods

• Hours

What is the Hadeano eon marked by?

• Formation of oceans

• Bombardment of celestial bodies and intense volcanism

• Presence of cyanobacteria

During which eon did the first oceans form?

• Hadeano

• Arqueano

• Proterozoico

The Proterozoico eon is marked by the presence of _______.

• cyanobacteria

• dinosaurs

• mammals

• flowering plants

What does the Pré-Cambriano period include?

• Only the Hadeano eon

• Hadeano, Arqueano, and Proterozoico eons

• Only the Proterozoico eon

What significant event occurs at the beginning of the Phanerozoic era?

In which era did the Cambrian explosion occur?