Download ES1 Absolute/Relative Dating Notes #3

Name__________________________Block_____ Date____________
ES1 Absolute/Relative Dating Notes #3
Rocks, Fossils,
Minerals
Minerals/Rocks/Fossils Unit
Do your table section, all do bottom of p.2 B4 and diagram ahead. Makeup,
Check website handout version for new hints &/or changes in red
yay, bonus pt. because
________
bottom
of HO,
p. 2book, heading
oops, no
on this date______=MP
A. How is the absolute age of rock materials determined?. Tables 1,2, good pg, diagram_______
Absolute age means p 191________________________________________
1. p 195 Radioactive decay of isotopes is one way to date rocks absolutely
It compares the ratio of:__________________ to ________________________
a. radioactive means:
b. How does one radioactive element change to another?
(1) p 194 What is radioactive half-life?
(a) p 193 parent material, or isotope, means, & give example
(b) daughter material, or isotope, means, & give example
(c) What does half-life helps calculate, and how?
c example: Uranium dating p 193. Tables 3,4, good pg, diagram_______
(1) How many neutrons, electrons, and protons does U238 have? use p 84-85
(2) What does U238 change into finally, and how?
(3) Usefulness of U238 dating (types of materials)
d. example: Carbon Dating p 196
(1) Uses radioactive carbon called ________ which decays into________
(2) Half life of C 14:______________ Tables 5,6, good pg, diagram_______
(a) time limits of Carbon Dating
(3) Materials for which Carbon Dating is useful
2. Another way for absolute dating is to use varves, p 192
a. Define and describe varves:
b. How are varves formed?
c. How do varves help determine geologic age? Tables 7,8, good pg, diagram______
3. Another way is to date rocks absolutely is to study rates of erosion and deposition
Pg. 1 of 2 ES1 Minerals Absolute/Relative Dating Notes Sanders-Fleming 5/2/16 12:55 PM
a. erosion means and is caused by:
b. deposition means and is caused by:
Examples of deposited features from oceans, minerals units:
c. what affects thickness of sediment layers? Tables 9,10, good pg, diagram_______
d. why are erosion and deposition sometimes difficult to use for absolute age?
(1) examples:compare rates of glacial river, lake flood erosion:
B. Determining relative age of rock
Relative age means: p 186_________________________________________________
1. Law of superposition: In what pattern are sedimentary layers deposited?________________
a. Where are youngest layers usually found?__________________
b. How do sediment sizes show age?
Tables 11,12 good pg, diagram_______ c. How do ripple marks show order of rock layers?
2. p 189 Unconformities are:
a. How are they formed?
(1) Use which law to find where oldest rocks are in unconformities? p 190
3. Law of crosscutting relationships p 190 means:
a. What are faults? (all do B4) Table 13 good pg, diagram_______
(1) How do they show age of layers?
b. What are intrusions?
(1) How do they show age of layers?
Grade for table section___________No
diagram=______
Complete from website key for _____
MU: appropriate
question(s) for your
section from p . 190,
# 1-3,6 & 196 # 1-6.
Forgot grade abbreviations? See class
sign, Ipass progress
report “notes to
class”, ES2 home
pages on Mrs. S-Fs
website. MCGC
CIC L FL. Make
corrections in another color.
Pg. 2 of 2 ES1 Minerals Absolute/Relative Dating Notes Sanders-Fleming 5/2/16 12:55 PM