How are P and S waves generated?
GeologyBoth P and S waves travel outward from an earthquake focus inside the earth. The waves are often seen as separate arrivals recorded on seismographs at large distances from the earthquake. The direct P wave arrives first because its path is through the higher speed, dense rocks deeper in the earth. How are S waves
How did the Appalachian Mountains affect the development of the United States?
Geology and GeographyThe Appalachian Mountains start between southeastern Canada, and Maine in the Untied States, and finish in central Alabama. During colonial America, the mountain range acted as a barrier separating the East Coast colonies from the Midwest frontier. Why are the Appalachian Mountains important? The mountains have played an important role in the history and economic
What is volcanic rock dust?
GeologyVolcanic Rock Dust is an organic fertilizer consisting of crushed basalt, a volcanic rock, which contains minerals and trace elements which have been ground into a fine dust. What is volcanic rock dust used for? Volcanic Dust is a Bio-Dynamic soil activator which is great for mineralizing and softening soils. It helps give fruit and
Why is volcanic rock black?
GeologyThe shade of blue of this rock is closer to gun-metal and is probably caused by the refractive index of the glass. Eventually, with exposure to the elements, the color of the rock turns to black. As older lava flows weather, the minerals in the rocks oxidize and often turn to clay minerals. Why is
What are examples of mass movement?
GeologyMass wasting is the movement of rock and soil down slope under the influence of gravity. Rock falls, slumps, and debris flows are all examples of mass wasting. What are 4 examples of mass movement? There are four different types of mass movement: Rockfall. Bits of rock fall off the cliff face, usually due to
How far out is Continental Shelf?
Geology200 nautical milesno more than 200 nautical miles from the nation’s coastline. How far out does the continental shelf extend? 200 nautical miles Article 76(1) provides that the continental shelf extends to “the outer edge of the continental margin or to a distance of 200 nautical miles,” whichever is further. How far out is the
Where are glacial landforms found?
Geologyglacial landform, any product of flowing ice and meltwater. Such landforms are being produced today in glaciated areas, such as Greenland, Antarctica, and many of the world’s higher mountain ranges. In addition, large expansions of present-day glaciers have recurred during the course of Earth history. Where are glaciers is found? Glaciers exist in both the
What are the 3 eras?
GeologyThe Phanerozoic Eon is divided into three eras, the Paleozoic, Mesozoic and Cenozoic eras. These were named for the kinds of fossils that were present. The Cenozoic is the youngest era and the name means “new life”. What are the 3 eras of history? Periodized human history is commonly divided into three main eras –
Où et comment se forme le magma ?
GeologyLes magmas se forment à haute température et sous haute pression par fusion partielle de la croûte terrestre ou du manteau. Moins denses que les roches solides de la lithosphère, ils sont entraînés vers le haut par la poussée d’Archimède, sous forme de dykes ou de diapirs. Où se forme les magma ? Formation du
Where are lateral moraines found?
GeologyA lateral moraine forms along the sides of a glacier. As the glacier scrapes along, it tears off rock and soil from both sides of its path. This material is deposited as lateral moraine at the top of the glacier’s edges. Lateral moraines are usually found in matching ridges on either side of the glacier.