ATM 200 - Natural Disasters

Ch 17 – Impacts with

Space Objects

Wed., 4 November 2015

Daily Announcements:

1) Exam #2 grades are posted on Blackboard.

3) Monday, Nov. 9, is the last day to drop any course with a “W”.

Song #1: “Second Chance” by Shinedown

Song #2: “Ride the Comet” by Ayreon

Text Source Today: Chapter 17 (p. 462-472)

· Crater-Forming Impacts Notes Template

· Problems for Life from Impacts PDF DOC

· Near-Earth Objects (NEOs) – Apophis?

· Mitigation Strategies?

· Tunguska, Siberia, 1908, Chelyabinsk, Russia, 2013

· Barringer Crater, Arizona, ~50,000 years ago

· The K/T Impact, ~65 million years ago

Study Guide Material (Stacey’s Guide) :

1) How many impact craters are there worldwide? In the U.S. and Canada?

2) Know the effects of a large asteroid impact on land and in the oceans.

3) What are NEOs? What is the “Torino Scale”?

4) What are the possible mitigation strategies for a potential impact?

5) What is the significance of Asteroid 99942, also known as “Apophis”?

6) What was the biggest impact event of the 20^th Century?

7) Was the Barringer Crater in AZ created by a large or small impact?

8) What led Luis Alvarez to propose that an asteroid impact killed the dinosaurs?

9) How and where did they eventually locate the crater from the K/T impact?

10) †Statistically, are you more likely to be killed by a tornado or by an

asteroid with a diameter of 1 km or greater in the next 50 years?