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 Day LEQ: How does the geologic timescale help us visualize the past?
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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?
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?
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