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Lahar Lab

There are hints for the worksheet located on the last slide of this PowerPoint Presentation. Lahar Lab. Mount Rainier’s Autobiography. Strata:. Strata are layers of rock and other sediment. Sediment can be soil, glacial deposits, volcanic ash, lava flows, sand, cinders, etc.

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Lahar Lab

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  1. There are hints for the worksheet located on the last slide of this PowerPoint Presentation. Lahar Lab Mount Rainier’s Autobiography

  2. Strata: • Strata are layers of rock and other sediment. • Sediment can be soil, glacial deposits, volcanic ash, lava flows, sand, cinders, etc.

  3. Principle of Super Position: • The oldest layers of rock are deeper and the newest layers of rock are closer to the surface (for the most part). • The deeper you go, the older the rock. • The K-T boundary is a layer that was deposited about 65 mya. It has very high levels of iridium (a radioactive element).

  4. An exposed area that includes the K-T Boundary near Denver.

  5. Lahar: • A Tibetan word that means mudflow/landslide. • Lahars can be caused by earthquakes, floods and eruptions. • Lahars can travel for dozens of miles.

  6. Lahar Hazards from Mt. Rainier

  7. Tephra: • An ash cloud from a volcanic eruption that settles over a few days or weeks and forms a rock layer. • Tephra can travel hundreds of miles.

  8. Mount Mazama: • Mt. Mazama is the name given to the volcano that is now Crater Lake. • Crater Lake is in central Oregon.

  9. Hints for the worksheet Question 3: IF YOU HAVE THE ANSWER OF 15O YEARS AGO (OR 1866), TAKE ANOTHER LOOK. Question 4: IF YOU SAID LIKELY, TAKE ANOTHER LOOK. Question 5: IF YOU SAID LIKELY, TAKE ANOTHER LOOK. Question 6: YOU NEED TO HAVE THE CORRECT ANSWER (YEAR) FOR #3 TO GET THIS ONE RIGHT. Question 7: WHAT NEEDS TO HAPPEN TO HAVE GLACIERS AND WHAT NEEDS TO HAPPEN TO HAVE GLACIAL DEPOSITS? Question 10: DON’T OVER THINK THIS ONE. NOT ALL CATASTROPHIC PROCESSES NEED TO BE VOLCANIC IN ORIGIN. Question 12: IF YOU SAID YES, TAKE ANOTHER LOOK.

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