types of chemical erosion and rocks formed pdf

Types of chemical erosion and rocks formed pdf

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Rock cycle

Types of Chemical Weathering

Rock types

Rock cycle

The rock cycle is a basic concept in geology that describes transitions through geologic time among the three main rock types: sedimentary , metamorphic , and igneous. Each rock type is altered when it is forced out of its equilibrium conditions. For example, an igneous rock such as basalt may break down and dissolve when exposed to the atmosphere , or melt as it is subducted under a continent. Due to the driving forces of the rock cycle, plate tectonics and the water cycle , rocks do not remain in equilibrium and change as they encounter new environments. The rock cycle explains how the three rock types are related to each other, and how processes change from one type to another over time. This cyclical aspect makes rock change a geologic cycle and, on planets containing life , a biogeochemical cycle. When rocks are pushed deep under the Earth 's surface, they may melt into magma.

Types of Chemical Weathering

Extrusive, or volcanic, igneous rocks are formed when molten hot material cools and solidifies. There are three main types of rocks: sedimentary, igneous, and metamorphic. Each of these rocks are formed by physical changes—such as melting , cooling , eroding, compacting, or deforming—that are part of the rock cycle. Sedimentary Rocks Sedimentary rocks are formed from pieces of other existing rock or organic material. There are three different types of sedimentary rocks: clastic, organic biological , and chemical. Clastic sedimentary rocks, like sandstone, form from clasts, or pieces of other rock.

The two main types of weathering are physical and chemical weathering. This page describes mechanical physical weathering and more. Rocks are naturally fractured at several levels. Mineral grains have boundaries, which can be areas of weakness in the rock. Sedimentary rocks next time often are layered and the layers sometimes are not bound together well. More massive rocks can have joints cracks which have no relative motion across them, only spreading which will open as the rocks are exposed due to erosion. Physical weathering acts to widen these rock fractures.

Rock types

Chemical action; Chemical alteration; Chemical decomposition; Chemical process; Chemical reactions. Chemical processes need water, occurring more rapidly at higher temperature, so they are more common in warm and wet climates. There are different types of chemical weathering processes, such as solution, hydration, hydrolysis, carbonation, oxidation, reduction, and chelation. Some of these reactions occur more easily when the water is slightly acidic.

Rock , in geology , naturally occurring and coherent aggregate of one or more minerals. Such aggregates constitute the basic unit of which the solid Earth is composed and typically form recognizable and mappable volumes. Rocks are commonly divided into three major classes according to the processes that resulted in their formation. These classes are 1 igneous rocks, which have solidified from molten material called magma; 2 sedimentary rocks, those consisting of fragments derived from preexisting rocks or of materials precipitated from solutions; and 3 metamorphic rocks, which have been derived from either igneous or sedimentary rocks under conditions that caused changes in mineralogical composition , texture, and internal structure. These three classes, in turn, are subdivided into numerous groups and types on the basis of various factors, the most important of which are chemical, mineralogical, and textural attributes.

Weathering and soil formation

Geomorphology of Desert Environments pp Cite as. Recent studies of weathering in deserts e.

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