What are the forces in Earth’s crust?
Regional SpecificsThree different kinds of stress can occur in the crust—tension, compression, and shearing. Tension, compression, and shearing work over millions of years to change the shape and volume of rock. Shearing pushes a mass of rock in two opposite directions. What are the forces acting on Earth’s crust? Four types of stresses affect the Earth’s
Where can siltstone be found?
Regional SpecificsWhere is It Found? Siltstone is deposited in a similar environment with shale, but is usually located near the old delta, lake or sea shore, where calm currents cause less particle suspension. Siltstone is generally formed adjacent to sandstone deposits – ie close to beaches and delta edges where sand is deposited. What is siltstone
What is a fossil cast and mold?
Regional SpecificsFossil molds and casts preserve a three-dimensional impression of remains buried in sediment. The mineralized impression of the organism left in the sediment is called a mold. The mineralized sediment that fills the mold recreates the shape of the remains. This is called a cast. What are fossil casts? FOSSIL CASTS are found when a
What did Steno first observe about crystals?
Regional Specifics[2,3] While studying quartz, Steno discovered the law of angular constancy, i.e. the fact that the surfaces of crystals are always at the same angle to each other, regardless of their size or shape. What did Nicolaus Steno discover? Steno was the first to realize that the Earth’s crust contains a chronological history of geologic
What is the layer of the mantle?
Regional SpecificsThe mantle is divided into several layers: the upper mantle, the transition zone, the lower mantle, and D” (D double-prime), the strange region where the mantle meets the outer core. The upper mantle extends from the crust to a depth of about 410 kilometers (255 miles). What is the layer mantle made of? silicate rocks
Which sedimentary rock is formed by compaction and cementation of land derived sediments?
Regional SpecificsShaleShale = clastic; silicate; formed by compaction and cementation of MICROSCOPIC land derived sediments. Are sedimentary rocks formed from compaction and cementation? This process is called compaction. At the same time the particles of sediment begin to stick to each other – they are cemented together by clay, or by minerals like silica or calcite.