By: Pat Gray
A percolation, "perc" or "perk" test is used to determine whether the soil absorption rate is sufficient for the anticipated capacity of a septic system or leach field. The perk test also indicates the best location and layout for the drain field, or whether an...
By: John Atchison
The world has always been fascinated by exploring the unknown. Going back over history, explorers and conquerors alike traversed the globe, hoping to find new lands and untold riches. Fast forwarding to present day, most all of the world has now felt the footsteps of...
Rocks and their formation in geology
By: Mayja Ignacio
Rocks are compositions of minerals that occur naturally. They consist of elements or compounds that are homogeneous - having the same composition and structure - having regular arrangements of atoms. The Earth’s crust is composed mostly of rocks. It can be found everywhere. It...
By: Dr. Bryan Katz
Rocks remember. This is a favorite maxim of geologists and planetary scientists. Essentially this means that the composition of a rock yields important clues about its origin. In geologic terms, a rock is an aggregate of one or more minerals. Minerals, in turn, are composed...
By: Julie Thomas-Zucker
Movement of water, by means of erosion and geology along with climate, is responsible for creating river landforms. Their shapes reveal their ages. Young rivers have valleys in V-shapes and irregular depths. Mature rivers have long sloped valleys and meandering streams. Sluggish streams and oxbow...
By: Blaise Pascal
The Earth's surface is covered with geographic features. Mountains, canyons, caves, rocky shores, islands, and beaches are just some of the many examples of different landscapes that are present on the planet. One thing in common that all of these features share is that they...
By: Teodor
According to the theory of plate tectonics, the outermost layer of the earth, called the lithosphere, is divided in pieces, which float over the mantle layer and move across the surface of the earth relative to each other. There are 12 major plates that float...
An explanation of the theory of plate tectonics
By: Karen Parker - 704366
Plate tectonics is a theory proposed by H. H. Hess in 1960 to explain the mechanics of continental drift. The theory proposes that the crust of the Earth, together with the upper portion of the mantle, which forms the lithosphere, consists of rigid slabs or...
By: D. Vogt
The Matternhorn - the massive, distinctive peak that marks the Swiss-Italian border in the Alps - is important not just to climbers but also to geologists. The Matternhorn's pyramidal peak is a textbook example of the effects of glacial erosion. The mountain is also living...
By: D. Vogt
Mount Fuji is Japan's highest and most striking mountain. It is also still considered to be an active volcano by geologists, although it is not expected to erupt in the near future. In addition to being a memorable and striking vista and a potential source...

 

1 90 91 92 93