Mt. Hood's Volcanic Past, Warren Falls, Yellow Tuft Alyssum (24x4)
Bemutató időpontja: 2012 Nov 25
Mt. Hood's Volcanic Past
Mt. Hood is an active volcano with a history of relatively recent eruptions.
Warren Falls
A man-made waterfall in the Columbia Gorge blocks a natural fall. One man wants to end that.
Yellow Tuft Alyssum
A new invasive species from Europe has been introduced in the Illinois River valley.
