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Dialogue 2004 #3

 

Appalachian Odyssey

Appalachian Odyssey

Intermediate

In the American southwest, some particularly unique and dramatic landscapes have been preserved in the national parks. No one can fail to be impressed by the steep V-shaped gorge and the diagonal patterning (between horizontal erosion surfaces) which characterizes the rocks of Zion National Park in Utah. Similar sandstone rocks extend over a seven-state area, but they are not all called by the same name. In various parts of their range, these rocks are known either as Navajo, or Aztec, or Nugget Sandstone. Read the rest of this entry »


Nifty Noses

Nifty Noses

IntermediateIntroductory

Of the five senses which keep us in touch with the world, most of us are particularly aware of eyesight and hearing. Of course we are very thankful for these gifts. One sense that we tend to take for granted however, is the sense of smell. This sense does not seem very complicated or amazing. Nevertheless a little research reveals that our sense of smell is not only exquisitely designed, but it is also poorly understood by biologists. Of all our senses, that of smell seems to be the most complicated. Read the rest of this entry »


August Sky

August Sky

IntermediateIntroductory

Do you ever take a moment to gaze at the night sky? During late August and early September of 2003, who could miss the sharply focused bright red spot in the sky? Other celestial bodies may have seemed faint and far away, obscured perhaps by light pollution, but that bright body claimed our whole attention anyway. It was Mars, the red planet, which burnt into our memories. The interesting thing is that this scene was just as remarkable and unique as it appeared. Astronomers tell us that Mars has not been this close to Earth in 60,000 years. They base such conclusions on computer models of planetary motion. However, in a young universe, it may be that Mars has never approached us this closely before. We live in special times. Read the rest of this entry »