Did you know that "megalith" means "big rock", which is certainly a good description of Stonehenge?
Earth and Space Science Concept of the Day
Do you know what this word or phrase means?
Magnetic polarity reversal
xMagnetic polarity reversal : A magnetic polarity reversal is a change of the earth's magnetic field to the opposite polarity. This has occurred at irregular intervals during geologic time.
Daniel Wolf Savin, a scientist at Columbia University, has published a paper on the research he and his colleagues have done on how stars began. In their research, the scientists built an apparatus to...Read more