Day 26

1
Day 26
What are the three major types of rock?
igneous, metamorphic, and sedimentary
What's the main difference between the three rock
types?
The main difference is in how they form
Daily Warm-Up Exercises
1
2
Compare Time Scales

• Contrasting Case Activity 4
• Earth History, Investigation 6

3
Age of Earth
Earths history is measured in millions of years.
How much is a million?
1,000 times 1,000
1,000 thousand
Earth was formed about 4,500 million years ago.
How much is 4,500 million?
4,500 times 1,000 times 1,000
4,500 thousand thousand
4,500,000 thousand
4
Human Life
Humans first appeared about 200,000 years ago.
How much is 200,000?
200 times 1,000
200 thousand
How does our age compare with Earths?
Compare Time Scales
4
5
Numeric Scale 1 - Table
6
Complete Column 1
Table Timeline
Which part looks like it lasted longest?
When did precambrian time begin?
When did precambrian time end?
How long did precambrian time last?
When did the paleozoic era begin?
When did paleozoic era end?
How long did paleozoic era last?
When did modern humans appear?
Paleozoic Era
4,500 mya
570 mya
3930 million years
570 mya
245 mya
325 million years
200,000 years ago
Compare Time Scales
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7
Numeric Scale 2 - Timeline
8
Complete Column 2
Table Timeline
Which part looks like it lasted longest?
When did precambrian time begin?
When did precambrian time end?
How long did precambrian time last?
When did the paleozoic era begin?
When did paleozoic era end?
How long did paleozoic era last?
When did modern humans appear?
Paleozoic Era
Paleozoic Era
4,500 mya
4,500 mya
570 mya
570 mya
3930 million years
3930 million years
570 mya
570 mya
245 mya
245 mya
325 million years
325 million years
200,000 years ago
200,000 years ago
Compare Time Scales
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9
Proportional Scale 1 - Football Field
10
Complete Column 1
Football Field Clock
Which part looks like it lasted longest?
When did precambrian time begin?
When did precambrian time end?
How long did precambrian time last?
When did the paleozoic era begin?
When did paleozoic era end?
How long did paleozoic era last?
When did modern humans appear?
precambrian time
0 yards
87 yards
87 of 100 yards
87 yards
95 yards
8 of 100 yards
99.99 yards
Compare Time Scales
10
11
Proportional Scale 2 - Clock
dinosaurs become extinct (1139 pm)
Today (midnight)
Earth is formed (midnight)
Rocky Mountains are formed (1114 pm)
START
END
flowering plants appear (1112 pm)
first dinosaurs (1042 pm)
modern humans appear (seconds before midnight)
Great Extinction (1033 pm)
12
12
first reptiles (1024 pm)
1
11
1
11
Ceno- zoic Era
first amphibians (1004 pm)
Mesozoic Era
first insects (952 pm)
first land animals (946 pm)
(1042 - 1139 pm)
10
10
2
2
first land plants (939 pm)
water appears on Earths surface (240 am)
Paleozoic Era (900 - 1042 pm)
first trilobites (905 pm)
3 pm
9 pm
3 am
9 am
Precambrian Time (1200 am - 900 pm)
Precambrian Time (1200 am - 900 pm)
4
4
8
8
earliest, bacteria-like life appears (520 am)
5
7
5
7
6 pm
6 am
Morning
Afternoon
12
Complete Column 2
Football Field Clock
Which part looks like it lasted longest?
When did precambrian time begin?
When did precambrian time end?
How long did precambrian time last?
When did the paleozoic era begin?
When did paleozoic era end?
How long did paleozoic era last?
When did modern humans appear?
precambrian time
precambrian time
midnight
0 yards
900 pm
87 yards
21 of 24 hours
87 of 100 yards
87 yards
900 pm
95 yards
1042 pm
8 of 100 yards
less than 2 hours
after 1159 pm
99.99 yards
Compare Time Scales
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13
Compare Categories
What can you learn about Earths history from the
numeric scales but not from the proportional
scales?
That Earth was formed 4,500 million years ago.
That it took thousands of millions of years for
plants and animals to appear.
14
Compare Categories
What can you learn from the proportional scales
but not from the numeric scales?
Its obvious that precambrian time is longer than
all three eras put together
You can easily see how young the human race is
compared to Earth.
You can see how far along in Earths history
different things happened.
Compare Time Scales
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15
Compare Categories
Could you include numeric information in the
clock or football field?
Add the date to each event or time division.
Could you include proportional information in the
table or timeline?
Make the size of each box show how long that
section lasted.