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1-Changes in Geology Over Time

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Chapter 5, Lesson 5: "Earth´s Moving Continents". Use your textbook to help you fill in the blanks pages 296 - 305. Click the word.

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Fill in the Blanks

1-Changes in Geology Over TimeOnline version

Chapter 5, Lesson 5: "Earth´s Moving Continents". Use your textbook to help you fill in the blanks pages 296 - 305. Click the word.

by Naneth Burquez
1

absolute life overturned half radioactivity imprints age amber superposition relative sediment age

What is relative age ?

1 . - Two ideas that help scientists determine the age of rock layers are original horizontality and .
2 . - Scientist compare the age of one rock layer to the age of another to find its .
3 . - Layers of rock can be tilted , folded , or by forces within Earth , making it difficult to determine their relative age .

What are fossils ?

4 . - Fossils can form when organisms die and are buried by , which replaces the hard parts of the body and hardens to form rock .
5 . - Some fossils are formed when organisms are trapped in flowing tree sap , which hardens to form .
6 . - Other fossils are formed when footprints or other quickly dry and become covered with sediment and preserved .

What is absolute age ?

7 . - The discovery of allowed scientists to determine how old a rock layer or fossil really is .
8 . - Rocks contain radioactive elements that decay into other elements at a constant rate called - .
9 . - A rock layer´s age in years is its .

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