(Courtesy Oregon Timber Trail) 1  Since 1992, hikers have been able to traverse Oregon north to south using the Pacific Crest Trail, which traces the Cascades from the Bridge of the Gods to the California state line. This summer, you can finally bike across the state, from Hood River to the mines of Modoc County, Calif.
Definition: A delta wave is a type of high amplitude brain wave found in humans. Delta waves have a frequency from one to four hertz and are measured using an electroencephalogram (EEG). These brain waves are thought to emerge from the thalamus and are generally associated with slow-wave sleep (during stages three and four of the stages of sleep.
A Delta is the land formed by sediment deposited by the end stages of a river. It often has a trianglular shape like the Greek letter Delta, hence the name.Usually its where the river meets the sea or other body of water.n geographical terms, a delta is defined as the alluvial deposit at the mouth of a river........ It is usually triangular in shape......... The term delta is also used to define a difference in temperature.......