I also got a "An Earth Scientist's Periodic Table of the Elements and Their Ions." The "normal" periodic table is useful for chemistry, but not as useful for the earth sciences. In the earth's crust the elements almost always exist in the form of ions: oxygen as O2-, silicon as Si4+, the metals in their …
Category: Geology
The Future of Mt. St. Helens
I'm going to speculate a little bit about the future of Mt. St. Helens. My basic assumption is that the volcano has a future eruptive history; it is unlikely that it will become an extinct volcano anytime in the near future. I'll give two scenarios for the next few hundred years of the mountain. Scenario …
The Fin at Mt. St. Helens
USGS/Cascades Volcano Observatory Mt. St. Helens, in Washington State, has been undergoing a slow eruption since October 2004. So far, this has been a relatively quiet eruption, compared to the explosive eruption of May 18, 1980. In the past year and a half, there have been a few minor eruptions that have ejected ash into …
Earthquakes and the End Times
Since today is the 100th anniversary of the great San Francisco earthquake... "There will be famines and earthquakes in various places. All these are but the beginning of the birth pains." Matthew 24:7,8 ESV A common "fact" proclaimed in Bible end-times prophecy books (Hal Lindsey and others), radio broadcasts, and on numerous web sites is …
San Francisco Earthquake, April 18, 1906
Today is the centennial of the great San Francisco earthquake and fire of 1906, which killed at least 700 (perhaps many more), and was one of the first earthquakes to be the subject of intense scientific study. The San Andreas fault had displacement along 477 km of its length, compared to the 40 km displacement …
Beauty in Stone
For the web site of the week, I have chosen Igneous rocks in thin section. In order to identify minerals and interpret the history of a rock, geologists will often make a thin section. A thin section is made by slicing and polishing a rock until it is only about 30 micrometers thick (human hair …
GeoChristian 