GeoPhysical: Student Objective Sheet Name: Date:

GeoPhysical: Student Objective Sheet
Name:_____________________________________________________ Date:____________________
Unit: 6- Earth History
Key Vocabulary:
Absolute age, relative age, extinction, fossils, geologic time, isotopes, Pangaea, radiometric dating/radioactive dating,
index fossil, trace fossil, superposition, crosscutting, unconformity, uniformitarianism, geologic time scale
Student Knowledge:
Student Skills:
That the Earth is very old, has changed in the past and
continues to change
That there are several methods for determining the age of
That there have been a number of extinction events in the
Earth’s past and that a number of hypothesis exist to
explain those events
How to read and obtain information from the geologic time
What ages of life forms existed through geologic time (e.g.,
the age of reptiles in the Mesozoic Era)
Describe how the Earth has changed and then identify
the mechanisms of change (weathering, erosion,
deposition, plate tectonics)
Compare and contrast methods used to determine age of
rocks (or organic material) and Earth structures (layers of
Given a diagram, be able to interpret the geologic
sequence of events that have taken place in an area.
(e.g., sedimentary layers deposited in layers before an
igneous intrusion cuts across them.
Research the past geologic history of an area (e.g.,
formation of the Grand Canyon , the Grand Valley)
Explain how the age of the earth is determined (moon
rock and other solar system data, as well as info from
rocks on earth)
READING GUIDE: Unit 6 – Earth History
Due Date:
Assignment: Chapter 23.6 pp.732-738 MES Ch 17 - 19
What is the difference between relative age and absolute age? Give an example of each 3 pts
Define the law of superposition and draw a simple diagram to illustrate it. 2 pts
What is an index fossil and how is it used to date the earth? 2pts
What is radioactive Dating and how is it used to date the earth? 2pts
What is the Geologic time scale? Draw a simple sketch showing the eras and periods – 15 pts
In geology, if a rock layer has been undisturbed it is horizontal and in layers (for sedimentary rock). If movement
and forces in the earth uplift and move these rock layers they change. The change or break in the geologic rock
record is called an unconformity. There are three types. – Name them, describe them , and sketch them in the
boxes below 6 pts
What is cross-cutting relationships? Sketch, label, and explain what knowing this relationship can tell us about
GeoPhysical: Student Objective Sheet
Name:_____________________________________________________ Date:____________________
Challenge Questions:
If you clearly understand the concepts of this unit, you should be able to answer the following.
1. Use the diagram to answer the following
Explain what happened at each number
Which is the oldest?
Which is the youngest?
Which layers show evidence of erosion? How do you know?
Use the graph to answer the following:
a). What is the half-life in years of the substance represented?
b) If a bone specimen is 23,000 years old, according to the data,
How many half-lives would have passed?
3. Which substance would be best for determining
the age of dinosaur remains from the Triassic
geologic period? Explain why
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