DISCUSSION QUESTION SET 2

DISCUSSION QUESTION SET 2 - DISCUSSION QUESTION SET 2...

Info iconThis preview shows pages 1–2. Sign up to view the full content.

View Full Document Right Arrow Icon
DISCUSSION QUESTION SET 2 October 4 – 6 Discussions Earth 20, Geological Catastrophes, Fall 2011, Professor Busby TURN IN THE ANSWER TO THE FIRST QUESTION AT THE BEGINNING OF YOUR DISCUSSION SECTION 1. What determines whether an eruption is explosive or effusive? Make a simple sketch that describes what happens to magma when it ascends to produce an explosive eruption. 2. Make a simple sketch of a Plinian eruption column. How is ash dispersed over wide regions during a Plinian eruption? What is "column collapse", and how does it generate pyroclastic flows? What kind of material is ejected during a Plinian eruption? 3. Define “debris flow”. How would you describe the morphology of a debris flow deposit? What is a lahar? Describe four ways a lahar may form. Why are lahars so much more dangerous than pyroclastic density currents? 4. Define the terms “avalanche” and “sector collapse”. Draw a simple cross section that shows how Mount St. Helens collapsed. What are the deposits of sector collapse/debris avalanche
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Image of page 2
This is the end of the preview. Sign up to access the rest of the document.

Page1 / 2

DISCUSSION QUESTION SET 2 - DISCUSSION QUESTION SET 2...

This preview shows document pages 1 - 2. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online