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Dynamic Earth

Dynamic Earth. Class 4 19 January 2006. Any Questions?. Today: Video: Dating the Earth. Homework #1 is due Homework #2 posted to website.

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Dynamic Earth

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  1. Dynamic Earth Class 4 19 January 2006

  2. Any Questions?

  3. Today:Video:Dating the Earth • Homework #1 is due • Homework #2 posted to website

  4. Two stratigraphic sections along with an igneous (unit A) and metamorphic (unit B) body are shown. The beds in the stratigraphic section are sedimentary in origin and are right side up (not overturned). Use the principles that you have learned in class to unravel geologic history: • Youngest • J • I • G (A) • A (G) • F (note unconformity) • E • D • C • B • Oldest

  5. What radioactive elements might you use to date an igneous rock that is approximately 1 billion years old?

  6. Geology in the News: Stardust • January 15, 2006 Stardust completed 2.88 billion mile journey to a comet and back • Its mission – return interstellar dust particles to Earth • First interplanetary probe from Earth flew deep into space and brought back bits of a comet • First U.S. mission designed to return samples from another Solar System body since the Apollo missions to the Moon in the 1960s and early 1970s

  7. Geology in the News: Stardust • Astronomers think comets are the oldest, most primitive bodies in the Solar System • Comets are frozen bodies of ice and dust • Composed of materials leftover after the planets formed around the Sun about 4.6 billion years ago. • Comets probably contain remains of materials used in the earlier formation of the stars • Particles returned by Stardust might even be older than the Sun • Comets are thought to contain organic materials essential for the origin of life • They may hold volatile carbon-rich elements that could provide clues to the nature of the basic elements of our Solar System • Studying comets today may provide evidence that these so-called dirty snowballs brought water to the Earth, making life possible • Studying the dust should shed light on the origin of the Solar System (age of the Earth) and origins of life on Earth

  8. Tuesday • Please read Chapter 2 in the text

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