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Science Today :. Future Paleontologist Project Presentations Today’s We’ll also Hand In: EH Unit Study Guide Rock Layer Puzzles Packet (if you still have this) “Time Marches On” Reading Guide (6.1). 3/7: Science Starter. List the rock layers & events in order from oldest to

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science today
Science Today:

Future Paleontologist Project Presentations

Today’s We’ll also Hand In:

  • EH Unit Study Guide
  • Rock Layer Puzzles Packet (if you still have this)
  • “Time Marches On” Reading Guide (6.1)
3 7 science starter
3/7: Science Starter

List the rock layers

& events in order

from oldest to

youngest.

important science dates
Important Science Dates:

Mon. 3/7:

  • Rock layer puzzles packet due

Wed. 3/9:

  • Sign-up Future Paleontologist Presentations

Thurs. 3/10:

  • EH Unit Test (& study guide due)
  • Future Paleontologist Application Projects Due (Presentations will start today)

Fri. 3/11:

  • Future Paleontologist Presentations-cont.
important dates
Important Dates:

Thurs. 3/10: EH Unit Test

  • Application Project Presentations
  • EH Study Guide Due

Fri. 3/11:

  • Application Project Presentations-cont.
3 9 science starter
3/9: Science Starter
  • How are Relative Dating & Absolute Dating Similar? How are they different?
3 9 science starter1
3/9: Science Starter
  • How are Relative Dating & Absolute Dating Similar? How are they different?
science starter 3 8
Science Starter 3/8:

1. True or False? Most organisms that have lived on Earth died and decomposed without leaving a fossil.

2. After 1 half life, what are the percentages of unstable atoms and stable atoms in a radioactive element?

  • A. 100% unstable atoms, 0% stable atoms
  • B. 50 % unstable atoms, 50% stable atoms
  • C. 25% unstable atoms, 75% stable atoms

3. Mrs. Keefe’s friend has 2 naughty dogs that she frequently has to dog-sit (It’s horrible!) . Atza is 4 years old and Coby is 1 year old. Do you know the dogs’ relative or absolute ages?

3 7 science starter1
3/7 Science Starter:

1. What word describes the time it takes for half of a radioactive sample to decay?

  • Name 2 types of radiometric dating.
  • If anyone brings cookies as part of their application project, what must we not let Blake do?
2 28 science starter
2/28: Science Starter:

Use your book, chapter 6, section 3 to find the answers to the following questions.

1. What is absolute dating?

  • What word describes the time it takes for half of a radioactive sample to decay?
  • Name 2 types of radiometric dating.
absolute dating

Absolute Dating

Chapter 6, section 3

slide11

Absolute Dating: determining the actual age in years of an event or object.

iPods-10/23/2001

CDs-1980s

Cassette Tapes-1970s-90s

8-Tracks-1960s-80s

Records-early 1900s

radioactive dating of rocks
Radioactive Dating of Rocks:
  • To determine the actual age of a fossil or rock scientists use radioactive dating and element half life to determine the ages of rocks (Absolute Dating)
slide13

Isotope: An atom with the same # of protons but with different # of neutrons.

  • Some isotopes are radioactive (unstable)
isotopes cont
Isotopes-cont.
  • Unstable Isotopes will change (& try to become more stable) over time
  • An Unstable Isotope (radioactive)works towards stabilityand changes into another kind of element.
  • Ex. Potassium-40 decays to argon and calcium.
radioactive decay
Radioactive Decay:
  • Radioactive decay – The process where radioactive substances (unstable) break down (change) into more stable substances.
  • Occurs at a steady (predictable)rate
radioactive decay p 162
Radioactive decay (p. 162)

The decay process occurs at a steady, constant rate

Radiometric Dating: (ratio)

Parent material

Daughter material

Stable

Unstable

radiometric dating of rocks
Radiometric Dating of Rocks:

Radiometric Dating: process of determining the exact age of a sample, based upon the ratio of parent material (old stuff) to daughter material (new stuff) .

slide18

Half Life: the length of time it takes for half of the radioactive atoms to change from an unstable form into a stable form(p. 163)

  • When rock forms = 100% unstable, 0% stable
  • After 1 half life = 50% unstable 50% stable
  • After 2 half lives = 25% unstable 75% stable
types of radiometric dating
Types of Radiometric Dating
  • Potassium-Argon Method:
  • Potassium  Half-life = 1.3 billion years

2. Uranium-Lead Method:

  • Uranium  Half-life = 4.5 billion years
  • Rubidium-Strontium Method:
  • Rubidium  Half-life = 49 billion years
  • Carbon-14 Method:
  • Carbon  Half-life = 5,730 years
slide20

Johnsonium 1027: half life of 5 years

Schmelingium 327

5 Years

5 Years

50% Keefeium

50% Meyerium

1 half-life

25% Keefeium

75% Meyerium

2 half-lives

100% Keefeium

0 half-life

slide21

Uranium 235: half-life 700 million yrs

Lead 207

1 half-life

2 half-lives

0 half-lives

50% Uranium 235

25% Uranium 235

100% Uranium 235

50%

Lead 207

75%

Lead 207

0%

Lead 207

Rock Formation

0 years old

700 million years old

1400 million y.o.

objectives you should be able to
Objectives: (you should be able to…)
  • Explain how fossils are used to establish the Earth’s history
    • Determine the difference between absolute and relative time
    • Know the importance of index fossils in geologic time
    • Understand how half life is used to date rocks
    • Understand where fossil fuels come from and the difference between renewable and nonrenewable resources
slide25

True or False? Most organisms that have lived on Earth died and decomposed without leaving a fossil.

2. After 1 half life, what are the percentages of unstable atoms and stable atoms in a radioactive element?

  • A. 100% unstable atoms, 0% stable atoms
  • B. 50 % unstable atoms, 50% stable atoms
  • C. 25% unstable atoms, 75% stable atoms
slide26

3. One example of a nonrenewable resource is ___________.

  • A. wind power
  • B. coal
  • C. wood

4. Ms. Johnson’s friend has 2 naughty dogs that she frequently has to dog-sit (It’s horrible!) . Atza is 4 years old and Coby is 1 year old. Do you now know the dogs’ relative or absolute ages?