Ho Hum

A very interesting topic is the low frequency hum that Earth generates, in the two and seven MHz range. Some research has come to light as to the processes involved:
Science pinpoints Earth's 'hum'
Earth's 'hum' springs from stormy seas
You can also get a lot off Google by using the phrase earth hum.
There are of course some other sources as well that have their own views, albeit very strange...
Taos Hum, Tones of Planet Earth
The Taos Hum
TAOS HUM HOMEPAGE
However the best case of strange views is here;
OUR PLANET IS EXPANDING
I suppose the Internet has made it possible for the weirdest of the weird to publish their ideas as well.
More to follow as I delve deeper...
Sites and Sounds