1. What is the difference between chemical and mechanical weathering?

2. What is an unconformity?3. How does weathering create unconformities?4. A rock is worn away by water. What type of

weathering is this?5. Copy and complete the following sentence:

An intrusion is (older/younger) than the layers of rock that it cuts through

10/6/11 A/B DayLEQ: How does the geologic timescale help us visualize the past?

Track your Progress: Unit 1 Quiz B-1 = 95 -9 = 55 -17 = 15-2 = 90 -10 = 50 -18 = 10-3 = 85 -11 = 45 -19 = 5-4 = 80 -12 = 40-5 = 75 -13 = 35-6 = 70 -14 = 30-7 = 65 -15 = 25-8 = 60 -16 = 20

Today’s LEQ: How does the geologic time scale help us visualize the past?

By the end of today, you should be able to…1. List the four parts of the geologic time scale in

order

2. List the divisions of geologic time in order

3. Explain how the geologic timescale helps us organize information

HOMEWORK DUE NEXT CLASS!!

Activator: “Timeline of My Life”• In your notebook, draw a timeline that depicts

your life from the day you were born to the present.

• What events did you put on your timeline?• Why would eating dinner or taking a shower NOT

go on your timeline?• What is the purpose of a timeline?

Think * Pair *Share

• What are the major divisions in our life as humans?

Infancy ChildhoodAdolescence Adulthood

Just like the timeline of your life…

…Scientists organized Earth’s history into this chart: the geologic time scale to help make sense of 4.6 billion years of time

What information do you think scientists might include on a timeline of earth’s

history?

FOCUS VOCABULARY

31. Geologic Timescale32. Precambrian Era33. Paleozoic Era34. Mesozoic Era35. Cenozoic Era

HOT Q• Which of the following events listed below would

NOT be included on the geologic timeline. EXPLAIN your answer in a COMPLETE SENTENCE!1. Extinction of ALL mammals on Earth.2. Asteroid the size of North America wipes out the

reptiles.3. A new species of rose bushes is found in California.4. Global Warming dries up all the oceans on Earth.

Number _____ would not be included on the geologic timeline because_______________.

TIMESCALE:

EON

ERA

PERIODEPOCHMEMORY

TRICK!!

E

E

EE

MEMORY TRICK!!OR

RIODPP

N

A

OCH

HOT Q!!

Which division of the geologic

time is the largest? Which is

the smallest

BRAINPOP: GEOLOGIC TIME

“Where Do I Go?”6 Volunteers• First bacteria appeared• First animals appeared• First dinosaurs appeared• Extinction of the dinosaurs• First mammals appeared• First humans appeared

Let’s See if You Were Correct

For ________% of Earth’s History, there was little to no life at

all!!

90

• How many million years ago did the first fishes appear?

• In what era did the first invertebrates appear?

HOT Q

• If earth’s history could fit into one 24 hour day, when would humans appear?

If the time scale were one year…

FIRST ANIMALS!!

FIRST DINOSAURS!

FIRST HUMANS!

PRECAMBRIAN TIME!

EOG QUESTION:WHICH OF THE FOLLOWING DIAGRAMS MOST

ACCURATELY REPRESENTS THE GEOLOGIC TIMESCALE?

GALLERY WALK!

http://player.discoveryeducation.com/index.cfm?guidAssetId=496FEF10-E97C-487A-A088-2783B54C6A4E&blnFromSearch=1&productcode=DSC

Discovery Education: Earth’s Geologic History

Students answer questions while watching the video

HOT Q: Some cartoons have shown early humans keeping dinosaurs as pets. From what you know about the geologic time scale and Earth’s History, is this possible? Why or why not?

Geologic Timeline COMIC STRIP!Use the Geologic Time Scale to , create a comic strip of Earth’s History. Your comic strip must include:

1. The 4 eras of the Geologic Time Scale in order2. The years for each era3. Pictures to illustrate each era4. One sentence to describe each comic strip box5. A minimum of 5 different comic strip boxes6. Major events (such as extinctions) in Earth’s History7. Your own NEW EON of the Geologic Time Scale (after the

Cenozoic Era)Use your notes and the textbook

(Section A pgs. 64-67)to help you!

Summarizer:

• Why would there be little to no fossils found in a rock layer that was formed during Precambrian time? (2-3 sentences)

1. What is the geologic time scale?2. What are the 4 divisions of the geologic time

scale?3. Which section of geologic time is the largest?4. Would you expect to find plant and animal fossils

from the early Precambrian period?5. Why or why not?

DATE A/B DayLEQ: How does the geologic time scale help us visualize the past?

Who Can Tell Me…• …How the dinosaurs became extinct• Watch this clip. As you watch, fill in

the blank below:– The dinosaurs became extinct

because _______________________

______________________________________________________________.

• http://www.youtube.com/watch?v=y4COsg8o02Q