Lecture_2_Earth_s_Structure_and_Geology

Lecture_2_Earth_s_Structure_and_Geology - Lecture 2: Earths...

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Click to edit Master subtitle style 11/28/10 Lecture 2: Earth’s Structure and Geology The Earth’s Structure; Geologic Processes; Rocks; Plate Tectonics
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11/28/10 How Old is the Earth?
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11/28/10
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11/28/10 Geologic Time Measuring geologic time can be done in two scientific ways: Absolute : measuring the age of rocks found at different locations and depths of the Earth how old is this rock? Relative : measuring the age of rocks relative to one another which of these two rocks is older?
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11/28/10 Absolute Dating of Rocks Absolute dating of rocks uses radioisotopes Radioisotopes are radioactive elements that are present in all rocks Radioisotopes each have a unique half- life that is known fairly well The best known of these are: Uranium-238 (4.5 billion years)
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11/28/10 Relative Dating of Rocks Watch the video: RelativeDatingV1.swf
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11/28/10 Key Features of Earth’s Structure Three Key Pieces: Core: most inner part; contains about 17% of Earth’s total volume Mantle: middle part of the Earth and 80% of its volume Crust: most outer part; thin and contains the last 3% of the Earth’s volume Where is the Lithosphere?
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11/28/10 The Earth’s Internal Structure
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11/28/10 The Core is divided in to two parts The inner core is suspected to be made of solid iron The outer core is molten (liquid) iron The outer core generates the Earth’s magnetic field
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Lecture_2_Earth_s_Structure_and_Geology - Lecture 2: Earths...

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