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Interpreting Geologic HistoryEarth and Space Science Earthcomm: Understanding Your Environment, pages 53-55
Geologic events such as deposition, erosion, folding, faulting, uplift, subsidence, igneous intrusion, volcanism, and metamorphism have changed the crust over time.
- Uplift – process where areas of the Earth’scrust are slowly raised due to expansion of the surrounding rock layers rocks tend to expand when heated
- Subsidence – process where areas of the Earth’s crust slowly sink due to the contraction of surrounding rocks rocks tend to contract when cooled
6 Basic Geologic PrinciplesCheck out this website YouTube clip Helpful website
1. Principle of SuperpositionYounger sedimentary and volcanic rocks are deposited on top of older rocks
2. Principle of Original HorizontalitySedimentary and volcanic rocks are laid down in approximately horizontal layers
3. Principle of Lateral ContinuitySedimentary and volcanic rocks are laid down in layers that are usually much wider (lateral extent) than they are thick
4. Principle Crosscutting RelationshipsIf one rock or geologic structure cuts across another rock unit or geologic feature the cutter is younger than the rock which is being cut
5. The law of included fragmentsThe fragments that make up a rock are older than the entire sample.
6. The Law of Folds or Tilts:Tilts in rocks are younger than the rocks themselves.
Geologic Cross-section #1
Geologic Cross-section #2
Geologic Cross-section #3
Who’s First? What is relative dating?
Unit 2 Lesson 2 Relative Dating
Ways to tell the age of a rock
Relative Dating : Which Came First?
Relative Age Dating Activity.
Sci. 3-2 Relative Dating: Which Came First?
The relative age of rocks and geological events.
Relative Dating and Sequencing Relative vs. Absolute Time Laws Unconformities Correlating Geologic Cross Sections.
Who “dun” it? Relative Time: Using layers of sequenced rock to find out which is older and younger Ages of events are placed in order of occurrence.
RELATIVE TIME: When the age of rock is compared to the ages of other rocks or events in geological time. Can determine which layers are older than others.
Relative Time: Ages of events are placed in order of occurrence.
Who “dun” it? Relative Time: Ages of events are placed in order of occurrence. No exact date is identified. Miss Miller is older than her students. Edison.
Section 4.2 The relative age of a rock is its age compared to the ages of other rocks. Ex. Mrs. Herrscher is older than her sister and brother.
Unit 5: Age of the Earth Objective:
The Relative Age of Rocks 10-2
Discovering Earth’s History
GEOLOGIC PRINCIPLES & RELATIVE DATING. HOW OLD IS THE EARTH? The Earth is about 4.6 billion years old Much of its history is recorded in the rocks Observations.
Chapter 8 Section 1 Page 190 #’s 1-6
Geology Review Game Ready your Mind!. Your teams are your table groups.
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