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4/19 & 4/20 - 7th Grade Agenda Learning Objective: Learn about Index Fossils Collect HW: Reading & Notetaking p.135-137 Pass back corrected HW & Test.

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Presentation on theme: "4/19 & 4/20 - 7th Grade Agenda Learning Objective: Learn about Index Fossils Collect HW: Reading & Notetaking p.135-137 Pass back corrected HW & Test."— Presentation transcript:

1 4/19 & 4/ th Grade Agenda Learning Objective: Learn about Index Fossils Collect HW: Reading & Notetaking p Pass back corrected HW & Test Video: Walking with Monsters before Dinosaurs Text Book Reading: 273 – 277 HW: Reading & Notetaking p. 138 – 139

2 Reflection Prompt: Describe how Igneous, Sedimentary and Metamorphic rocks are created.

3 What is relative age of a rock?
The relative age of a rock is its age compared to the ages of other rocks

4 What is the absolute age of a rock?
The absolute age of a rock is the number years since the rock was created.

5 Which layer is the oldest layer of rock?
Bottom Layer is the Oldest Layer Law of superposition: In horizontal sedimentary rock layer the oldest layer is at the bottom. Each higher layer is younger than the layers below it.

6 What is Igneous Intrusion?
Igneous Intrusion forms when magma cools and hardens beneath the surface Igneous intrusion is always younger than the rock layer around and beneath it.

7 Which is older? The fault or the rock layer?
A fault is a break in earth’s crust. A fault is always younger than the rock it cuts through.

8 Why is there gaps in the Geologic Record?
Unconformity is a gap in the geologic record.

9 What is an index fossil? Index fossils help geologists match rock layer To be useful as an index fossil, a fossil must be widely distributed and represent a type of organism that existed only briefly.

10 Which fossils are index fossils ?
Trilobite Ammonite

11 These rocks are some of the oldest fossils in the world
These rocks are some of the oldest fossils in the world. How old are they? Stromatolites: Remains of ocean reefs created by bacteria more than 3 billion years ago.

12 What is Radioactive Decay?
Radioactive Decay: over time, unstable elements break down or decay by releasing particles and energy.

13 What is half-life? The half-life of a radioactive element is the time it takes for half of the radioactive atoms to decay.


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