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Warm up ActivityAnswer this Warm up on the Top of your Notes
Packet1. Put the following events in order:
■ Nuclear Bomb dropped on Hiroshima, Japan (1945)■ Trump became President (2016)■ Pluto was no longer considered a planet (2006)■ The Internet was “invented” (1994)■ The U.S. launched the first space shuttle (1981)
2. How did you decide how to put them in order?
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RMS Time
■ Work on HW Packet #2
■ Work on assignments from other classes
■ Read
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Good Day Everyone!Today is Tuesday 10/3/17!
Agenda■Announcements■Warm Up
■Comparison kite Half-life
■Radiometric dating■Lab #2: Half Life■HW Packet #2
■Due Thursday 10/5/17
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Announcements
■ 10/4/17 : Picture Day!■ 10/5/17: HW Packet #2 due■ 10/6/17: Binder Check Friday ■ 10/10/17 : Earth’s History Unit Test
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Warm up ActivityExamine the image below. Write a paragraph describing what this graph shows. Justify your answer using evidence from the picture. Be detailed in your response and identify the type of graph you are looking at. Instead of restating what’s on the x and y axises, interpret the data (think about the type of graph you are looking at) and make connections. I challenge you to think deeper!!
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Turn and Talk: Relative vs. Absolute
■ What order did you put the events in? Why?
■ What does relative mean? ■ What does absolute mean? ■ What do you think these words mean
when describing age?
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Brain Pop
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You rock my
world
What did the
igneous rock say
to the volcano?
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Two types of Rock Dating
Relative Dating
■ The age of an object in comparison to another.
■ It helps scientist put things in order without giving a specific date.
Absolute Dating
■ actual age in years of a rock or fossil.
■ It tells you exactly how many years ago a rock or fossil formed.
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T-ChartRelative Age Absolute Age-Tells age compared to something else
-Uses words like “older,” “younger,” and “same age as”
-- Technique use to find it: Law of Superposition
Ex: I am younger than my brother.
-Tells the exact age
-Uses numbers to tell age
-Technique use to find it: Radiometric or Carbon 14 dating
Ex: My brother is 16 years old.
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Absolute Age
■ Geologists often also need to know the exact age of a rock or fossil.
■ Finding the exact age of an object is called absolute dating.
■ Remember “absolute” means exact or definite.O
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Technique used for Absolute Dating■ Radiometric or
Carbon-14 dating uses the half-life of atoms to figure out the absolute age of the rock layers.
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Absolute Dating using Carbon Atoms
■ All living things are made up of Carbon atoms.■ As living things decay, these carbon atoms may change into
a different type of atom.■ The original atom is called the parent material■ The new form of the atom is called the daughter material
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■ Half of the parent atoms turn into daughter atoms once the object has reached a certain age in the decaying process.
Parents and Daughters
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Parents and Daughters■ Scientists can learn the age
of a rock by counting the number of parent and daughter atoms.
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■ Scientists compare the number of parent atoms to the number of daughter atoms.
■ The more daughter atoms there are, the older the rock is.
■ This tells them how many times half the parent atoms turned into daughter atoms.
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Half-Life■ A half-life is the time needed for one-half of
the parent atoms to turn into daughter atoms.
■ Different atoms have different half-lives.
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Why use Carbon’s half life?■ Potassium-40- has a half-life of 1.3 billion years.
.■ Uranium-238- has a half life of 4.5 billion years
■ Carbon-14- has a half life of 5720
Shorter half life means more accurate age
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Half Life Chart
1. What is x-axis?2. What is y-axis?3. What is the percentage
of parent atoms after:a. 1 half life: b. 2 half lives:
3 half lives4. What pattern do you
notice?
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Fun Fact: Age of Earth
■ Scientists have used absolute dating to figure out the age of the earth.
■ By counting the parent and daughter atoms in some very old rocks, scientists say that the solar system (including Earth) is about 4.6 billion years old!
■ (4,600,000,000 years old!)■ That’s a lot of birthdays!■ Before this method was
invented, people believed Earth was only 6,000 yrs old.
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Radiometric Dating
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Relative vs. Absolute Partner Challenge
1. Fold a piece of paper in Halfa. One side- Relativeb. Other side- Absolute
2. Write it large enough so I can see it up front!
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Boards up-Relative vs. Absolute
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Boards up-Relative vs. Absolute
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Boards up-Relative vs. Absolute
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Boards up-Relative vs. Absolute
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Boards up-Relative vs. Absolute
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Boards up-Relative vs. Absolute
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Boards up-Relative vs. Absolute
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Boards up-Relative vs. Absolute
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Boards up-Relative vs. Absolute
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Boards up-Relative vs. Absolute
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Boards up-Relative vs. Absolute
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Boards up-Relative vs. Absolute
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Comparison Kite
RelativeDating
Picture
AbsoluteDating
Picture
Both
Picture
Write a paragraph of at least5 sentences comparing and contrastingRelative and Absolute Dating.
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Good Morning
1.You need to be IN YOUR SEAT workinga. If I have to talk to you, SILENT LUNCH
2.Work on your Rock Dating HW packet3.Work on other class assignments4.Read
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Warm Up1. List major 5 events in your life so far2. Write How old you were beside each event
i. Ex: Birthday- 0 years old 1st day of school- 5 yrs old….
Turn and TalkHow would you explain this by relative age and how would you explain each by absolute age?
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Half Life Twizzler Lab Activity
1.DO NOT EAT THE Twizzler until I say so2.Questions to discuss in pairs:
a.What does the X-axis show?b.What does the Y-axis show? c.What is another name for Radioactive
Material? (it’s a vocab word)
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Half Life Twizzler ActivityRa
dioa
ctiv
e m
ater
ial
45 90 135 180 225 Time in Seconds
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Half Life Twizzler ActivityRa
dioa
ctiv
e m
ater
ial
45 90 135 180 225 Time in Seconds
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Discovery Ed Video
As you watch, add things to the T-Chart in your notes for Absolute or Relative Dating