Because of the nature of the earth
And because it is stronger than the erosion and weathering by far
Focus
The epicentre
The epicentre
They are both words that re used to describe the origin of an earthquake. More specifically the focus is the point within the earth where the fault rupture and initial movement occur. The epicentre is the point on the Earth's surface directly above this.
In arid climates, the main source of erosion is wind. The general wind circulation moves small particulates such as dust across wide oceans thousands of kilometers downwind of their point of origin, which is known as deflation. Erosion can be the result of material movement by the wind. There are two main effects. First, wind causes small particles to be lifted and therefore moved to another region. This is called deflation. Second, these suspended particles may impact on solid objects causing erosion by abrasion (ecological succession). Wind erosion generally occurs in areas with little or no vegetation, often in areas where there is insufficient rainfall to support vegetation. An example is the formation of sand dunes, on a beach or in a desert. Loess is a homogeneous, typically nonstratified, porous, friable, slightly coherent, often calcareous, fine-grained, silty, pale yellow or buff, windblown (aeolian) sediment. It generally occurs as a widespread blanket deposit that covers areas of hundreds of square kilometers and tens of meters thick. Loess often stands in either steep or vertical faces. Loess tends to develop into highly rich soils. Under appropriate climatic conditions, areas with loess are among the most agriculturally productive in the world. Loess deposits are geologically unstable by nature, and will erode very readily. Therefore, windbreaks (such as big trees and bushes) are often planted by farmers to reduce the wind erosion of loess.
Clastic sedimentary rocks are formed by the weathering, erosion, deposition, compaction and cementation of other rocks. Chemical sedimentary rocks however may be precipitated directly from saturated solutions (examples incldue the evaporitic rocks and certain types of carbonates such as oolitic limestones). Some other sedimentary rocks may be biogenic in origin (such as the linmestones that are formed of coral reefs).
Limestone is formed from particles derived from organic processes, usually in a marine environment. Sandstone particles are derived from the weathering and erosion of silicate bearing rocks, normally.
impact from meteors. erosion. volcanic activity.
Clastic sedimentary rocks are formed by the weathering, erosion, deposition, compaction and cementation of other rocks. Chemical sedimentary rocks however may be precipitated directly from saturated solutions (examples incldue the evaporitic rocks and certain types of carbonates such as oolitic limestones). Some other sedimentary rocks may be biogenic in origin (such as the linmestones that are formed of coral reefs).
The weathering, erosion, and deposition of the rock rhyolite could result in the compaction and cementation into sedimentary rock of different types: breccia, conglomerate, sandstone, mudstone, or shale. Which type depends on the degree of weathering and the distance from the point of origin of the original rhyolite.
Clastic sedimentary rocks are formed by the weathering, erosion, deposition, compaction and cementation of other rocks. Chemical sedimentary rocks however may be precipitated directly from saturated solutions (examples incldue the evaporitic rocks and certain types of carbonates such as oolitic limestones). Some other sedimentary rocks may be biogenic in origin (such as the linmestones that are formed of coral reefs).
Eluvium.
The epicenter.
focus
The epicenter.
Shale is formed as a result of many processes. The first process involves the weathering and erosion of existing silicate rock, usually igneous or metamorphic in nature, and what would normally appear in a weathering mountain range. The weathering of this rock creates clay and silt sized particles which are transported down slope by the erosion from wind, moving water, gravity, and ice. These small particles are carried the farthest from their point of origin, and settle out from suspension in the water or wind in a process known as deposition. As more and more sediment layers are added over great lengths of time, the particles of sediment are compacted by the weight from above and the clay particles become loosely interlocked into a rock with thin depositional layering - shale.
Focus