What are synclines and anticlines?
GeologyFrom Wikipedia, the free encyclopedia. In structural geology, a syncline is a fold with younger layers closer to the center of the structure, whereas an anticline is the inverse of a syncline. A synclinorium (plural synclinoriums or synclinoria) is a large syncline with superimposed smaller folds. What are synclines and anticlines and how do they
What is the climate in Canadian Shield?
GeologyThe Canadian Shield is so large that the climate varies across it. Typical Canadian Shield: pines, lakes, bogs, and rock. In the southern parts, the climate is seasonal; the average temperature in the winter is -. 4 degrees F (-18 degrees C), and in the summer it is 77 degrees F (25 degrees C). What
What is called petrification?
GeologyIn geology, petrifaction or petrification (from Ancient Greek: πέτρα, romanized: pétra, lit. ‘rock, stone’) is the process by which organic material becomes a fossil through the replacement of the original material and the filling of the original pore spaces with minerals. What do you mean by petrification? 1 : to convert (organic matter) into stone
What Colour is basalt rock?
Geologydark gray to blackdark gray to black color. Basalts are formed by the rapid cooling of basaltic lava, equivalent to gabbro-norite magma, from interior of the crust and exposed at or very close to the surface of Earth. These basalt flows are quite thick and extensive, in which gas cavities are almost absent. What does
What are some features of the ocean floor?
GeologyFeatures of the ocean floor include the continental shelf and slope, abyssal plain, trenches, seamounts, and the mid-ocean ridge. The ocean floor is rich in resources. Living things on the ocean floor are used for food or medicines. Nonliving resources include oil, gas, and minerals. What are the 8 features of the ocean floor? There
What is the scale for volcanic eruptions?
GeologyVolcanic Explosivity Index (VEI) is a numeric scale that measures the relative explosivity of historic eruptions. Volume of products, eruption cloud height, and qualitative observations (using terms ranging from “gentle” to “mega-colossal”) are used to determine the explosivity value. Is there a scale for volcanoes? The Volcanic Explosivity Index (VEI) is a scale that describes
What is synclinal valley?
GeologyDefinition of synclinal valley : a valley produced by or coinciding in position with a synclinal fold. What is the meaning of synclinal? Definition of synclinal 1 : inclined down from opposite directions so as to meet. 2 : having or relating to a folded rock structure in which the sides dip toward a common
What is the parent rock of phyllite?
GeologyPhyllite Type Metamorphic Rock Miscellaneous Foliation surface has a satiny sheen and crinkled appearance Metamorphic Type Regional Metamorphic Grade Low Grade (Higher than Slate) Parent Rock Shale or Mudstone What rock does phyllite form from? metamorphic rock phyllite, fine-grained metamorphic rock formed by the reconstitution of fine-grained, parent sedimentary rocks, such as mudstones or shales.
Do strike slip faults cause tsunamis?
GeologyStrike-slip faults are not usually included in tsunami hazard assessments as they generally cause large horizontal (with limited vertical) displacements, and so are considered insufficient to generate large tsunamis unless they trigger a submarine landslide. Do tsunamis occur on strike-slip faults? Strike-slip faulting has generally been considered insufficient for triggering large tsunamis, except through the
How often does Washington State get earthquakes?
GeologyWashington, especially the Puget Sound basin, has a history of frequent earthquakes. More than 1,000 earthquakes occur in the state each year. A dozen or more are strong enough that people feel ground shaking. When was the last time Washington State had an earthquake? The most recent major earthquake, the Nisqually quake, was a magnitude