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7 th grade Science Name _________________________ Period _______ IMPORTANT EVENTS IN EARTH’S HISTORY Intervals have been marked on the timeline below. Mark 3 events per billion years in the first 4 billion years of time. On the last line (the last billion years), mark 5 events. 0 250 million years ago 500 mya 750 mya 1 Billion 1 bya 1.25 bya 1.5 bya 1.75 bya 2 Billion 2 bya 2.25 bya 2.5 bya 2.75 bya 3 Billion 3 bya 3.25 bya 3.5 bya 3.75 bya 4 Billion 4 bya 4.25 bya 4.5 bya 4.75 bya 5 Billion

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Page 1: IMPORTANT EVENTS IN EARTH’S HISTORYjjshsscience.weebly.com/uploads/2/2/9/1/22914792/geologic_timeline... · IMPORTANT EVENTS IN EARTH’S HISTORY ... Mark 3 events per billion years

7th grade Science Name _________________________ Period _______

IMPORTANT EVENTS IN EARTH’S HISTORY

Intervals have been marked on the timeline below. Mark 3 events per billion years in the first 4 billion years of time. On the last line (the last billion years), mark 5 events.

0 250 million years ago 500 mya 750 mya 1 Billion

1 bya 1.25 bya 1.5 bya 1.75 bya 2 Billion

2 bya 2.25 bya 2.5 bya 2.75 bya 3 Billion

3 bya 3.25 bya 3.5 bya 3.75 bya 4 Billion

4 bya 4.25 bya 4.5 bya 4.75 bya 5 Billion

Page 2: IMPORTANT EVENTS IN EARTH’S HISTORYjjshsscience.weebly.com/uploads/2/2/9/1/22914792/geologic_timeline... · IMPORTANT EVENTS IN EARTH’S HISTORY ... Mark 3 events per billion years

7th grade Science Name _________________________ Period _______ 1. Has life on Earth evolved quickly or slowly? Use the timeline to support your answer.

Life on Earth has evolved ___________________________________ (quickly/slowly) because _____________________

__________________________________________________________________________________________________

The timeline supports this because _____________________________________________________________________

__________________________________________________________________________________________________

__________________________________________________________________________________________________

2. Which event was the most important and why do think so?

The most important event in Earth’s history is _____________________________________________________ because

__________________________________________________________________________________________________

__________________________________________________________________________________________________

__________________________________________________________________________________________________

3. How can knowing about events that happened millions of years ago help us understand present day and future

years to come?

Knowing about events the happened millions of years ago helps us to understand today and future because __________

__________________________________________________________________________________________________

__________________________________________________________________________________________________

__________________________________________________________________________________________________

__________________________________________________________________________________________________

4. What is one thing that you learned about geological time?

One thing that I learned about geologic time is ___________________________________________________________

__________________________________________________________________________________________________

__________________________________________________________________________________________________

__________________________________________________________________________________________________

5. What is one question that you still have about geological time?

One question I still have about geologic time is ____________________________________________________________

__________________________________________________________________________________________________

__________________________________________________________________________________________________

__________________________________________________________________________________________________


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