Which of the following places the geologic time eras in order from oldest to most recent?

The ______________ era covers 80%-88% of earth's history.

The Geologic Time Scale is a record of what?

The biggest unit of time on the Geologic Time Scale is ___

(not one we have focused on)

Eras are broken into _______.

Of the following organisms, which was around (or has been around) for the shortest amount of time?

The geologic time scale is divided by major changes or events such as______.

Periods are broken up into smaller chunks of time called?

What time Era do we live in?

The series of time divisions that mark Earth's long history. It can be charted in many different ways.

In which "eon" were dinosaurs present? (not era or period)

Which EON name relates to visible life?

(you don't need a microscope)-- not an Era or Period

Known as the age of the mammals?

The dinosaurs and reptiles were dominant in which Era?

The disappearance of a species.

during this era, climate was a warmer than it is today and polar zones did not yet exist

Mammals evolved and diversified in this era

a mass extintion is

Which era is the longest?

The idea states the same processes that occurred in the past operate in the same way as they do in the present.

Jellyfish are one of the oldest species on Earth. In what time period did they first appear?

Which Era was mainly dominated by dinosaurs?

Which Era occurred last (most recent)?

Which period is closest to present day?

What type of environment do you think was present during the Devonian Period?

What is the oldest organism on the geologic time scale from the choices below?

Which organisms are the most recent (closest to present day)from the choices below?

A model scientists use to describe the timing of events and the relationships between those events in earth’s history.

What type of event usually marks the end of an Era

This period contained very large insects

Woolly mammoths appeared in the

Which period did "Lucy" the Australopithecus appear in?

We think our early atmospheric oxygen came from

Where did most of the life live during the Paleozoic era?

(we colored this section blue on our calendar)

Finding Fossils from the Precambrian Time are rare because_____.

The Cambrian Explosion is____

The Permian Extinction or "Great Dying" ended the _____era with about 95% of life going extinct . This was the biggest mass extinction our planet has ever faced.

The Mesozoic era is known as the age of____.

(We colored this green on our calendar.)

The earth was hit by a large asteroid and ended the ___ time era. This was called the K-T extinction.

The Cenozoic era is known as the age of ______.

One way that mammals survived the age of dinosaurs was to ______.

During Pre-Cambrian Time the ______.

The time period that has oil, coal, and natural gas and affects our world economy the most is________. $$$$

Coal is from _____and oil is from ______.

If all of earth's history was in one calendar year when did humans appear?