How coal is formed and how coal is formed

Under normal temperature and pressure on the surface, the plant remains accumulated in stagnant water bodies are transformed into peat or saprolite by peatization or saprolite. After peat or saprolite is buried.

It sinks to the deep underground due to the decline of the basin basement and is transformed into lignite by diagenesis. When the temperature and pressure gradually increase, it is transformed into bituminous coal to anthracite through metamorphism. Peat is the process by which the remains of higher plants accumulate in swamps and are transformed into peat through biochemical changes. Sludge is the process by which the remains of lower organisms are transformed into sludge through biochemical changes in swamps.

Saprolite is a silt-like substance rich in water and asphaltene. Glacial processes may contribute to the collection and preservation of coal-forming plant remains.

The age of the formation of coal].

Throughout the geological epoch, there are three major coal-forming periods worldwide:

1) In the Carboniferous and Permian of the Paleozoic, coal-forming plants were mainly robe plants. The main types of coal are bituminous coal and anthracite.

2) In the Mesozoic and Cretaceous, coal-forming plants were mainly gymnosperms. The main types of coal are lignite and bituminous coal.

3) In the Tertiary of the Cenozoic, coal-forming plants were mainly angiosperms. Host.

In the Paleozoic Era, 40 million to 50 million years ago, there were large forests growing on the earth, and with the movement of the earth's crust, a large number of trees were buried in the ground, which were isolated from the air for a long time, and under high temperature and high pressure, after a series of complex physical and chemical changes to form black combustible fossils, which is the formation process of coal.

Coal was formed slowly by burying a large number of plants in the ground hundreds of millions of years ago. Coal is a sedimentary organic mineral converted into plant remains through biochemical and physicochemical reactions, and is a mixture of a variety of polymer compounds and minerals.

In the history of the earth, the most favorable geological ages for the formation of coal are mainly the Carboniferous and Permian of the Late Paleozoic; Jurassic of the Mesozoic Era; and the Tertiary of the Cenozoic.

When we look at the cross-section of coal under the microscope, we can clearly see the growth ring lines of trees, which is a strong proof that coal evolved from trees.

Layers of coal are the continuous accumulation of layers of trees and plants, and after continuous geological changes, they have entered the underground in different years, and then under the continuous physical and chemical action, they have become today's layers of underground coal!

Advantages and disadvantages of coal:

Advantages: Coal resources are abundant, and because there are coal deposits all over the world, the mining and supply are stable, and the price is cheaper than oil and natural gas.

Disadvantages: The calorific value of coal is smaller than that of oil or natural gas, and the amount of carbon dioxide emitted by coal when burned is higher than that of oil and natural gas. The production is limited and it is not a renewable energy source.

Coal is the result of a systematic evolution of plant remains

Coal is a layer of extremely thick black humus accumulated on the ground by the branches and roots of plants for millions of years, which is continuously buried in the ground due to changes in the earth's crust, isolated from the air for a long time, and under high temperature and high pressure, after a series of complex physical and chemical changes and other factors, the formation of black combustible sedimentary rock, which is the formation process of coal.

Produced by the movement of the earth's crust.

Coal is a layer of extremely thick black humus accumulated on the ground by the branches and roots of plants for millions of years, which is continuously buried in the ground due to changes in the earth's crust, isolated from the air for a long time, and under high temperature and high pressure, after a series of complex physical and chemical changes and other factors, the formation of black combustible sedimentary rock, which is the formation process of coal.

Coal is a solid flammable mineral that was gradually formed by ancient plants buried in the ground and undergoing complex biochemical and physicochemical changes. It is a solid combustible organic rock, which is mainly formed by biochemical action of plant remains, buried and then transformed by geological action.

Coal was born around the time of the Carboniferous period (I don't remember exactly) when ferns covered the entire earth due to the abundance of vegetation. Their bodies were buried in the ground under the action of the subsequent crustal movements, and after hundreds of millions of years of sedimentation, they changed. Eventually turned into coal.

Due to the harsh conditions under which coal is formed, coal is concentrated in parts and aggregated with oil and gas. In the area where they are generated, there are generally layers of plant fossils. (One more point:.)

The area where coal is generated is divided into marine and terrestrial facies).

In the Paleozoic Era, 40 million to 50 million years ago, there were large forests growing on the earth, and with the movement of the earth's crust, a large number of trees were buried in the ground, which were isolated from the air for a long time, and under high temperature and high pressure, after a series of complex physical and chemical changes to form black combustible fossils, which is the formation process of coal.

Formation of coal.

In geological history, swamp forests have covered large areas of land and include plants such as fungi, ferns, shrubs, trees, etc. However, sea levels often change over time.

When the water level is raised, the plants die due to flooding. If these dead plants are covered with sediment and not permeable to oxygen, the plants do not decompose completely, but instead form organic formations underground. As the sea level rises and falls, multiple layers of organic strata are created.

After a long period of geological processes, this organic layer will eventually be transformed into a coal seam in a reducing environment with increased temperature and pressure. It is formed due to the difference in burial depth and burial time.

Coal is not the same.

Summary. Forests are air purifiers, natural oxygen plants, and natural mufflers; Forests have the role of natural epidemic prevention, climate regulation, change of low air flow, prevent sandstorms and reduce floods, conserve water sources, and maintain water and soil.

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Coal is a layer of extremely thick black humus accumulated on the ground by the branches and roots of plants for millions of years, which is continuously buried in the ground due to changes in the earth's crust, isolated from the air for a long time, and under high temperature and high pressure, after a series of complex physical and chemical changes and other factors, the formation of black combustible sedimentary rock, which is the formation process of coal.

Why do we want to protect forests?

What other examples can we give of them that are related to chemical changes?

Forests are air purifiers, natural oxygen plants, and natural mufflers; Forests have the role of natural epidemic prevention, climate regulation, change of low air flow, prevent sandstorms and reduce floods, conserve water sources, and maintain water and soil.

How do we determine how coal is formed? Experienced a chemical change?

The photosynthesis of trees and forests is a chemical change all the time.

How can we determine that coal has undergone a chemical change in the formation process?

Generally after seeking changes in the past hundred years and millennia, our scientists basically compare from the material content For example, the current excavation of ancient tombs, how to determine the age of experience is through the change in the material content found.

Remains of ancient plants.

The main components of coal are carbon, hydrogen, oxygen and small amounts of nitrogen, sulfur or other elements. Sulphur is one of the most important impurities in coal, which usually occurs in the form of sulfides in the combustion products of coal. In some countries, such as the United States, there are regulations to control sulfide emissions, and because the cost of removing such harmful impurities is not low, the production of low-sulfur coal is rewarded to reduce pollution.

Coal is thought to have been formed by the burial of ancient plant remains under the strata through the transformation of peat, lignite, bituminous coal, anthracite, and anthracite can be further converted into graphite.

Coal is a layer of extremely thick black humus accumulated on the ground by the branches and roots of plants for millions of years, due to the changes in the earth's crust constantly buried in the ground, isolated from the air for a long time, and under high temperature and high pressure, after a series of complex physical and chemical changes and other factors, the formation of black combustible sedimentary rock, this is the formation process of coal.

The thickness of the coal seam in a coal mine is related to the rate of crustal decline and the amount of plant remains accumulated in the area. The crust descends quickly, and the plant remains accumulate thickly, and the coal seam of this coal mine is thick, and conversely, the crust descends slowly, and the plant remains accumulate thinly, and the coal seam of this coal mine is thin.

In addition, due to the tectonic movement of the earth's crust, the original horizontal coal seams are folded and fractured, and some coal seams are buried deeper underground, and some are squeezed to the surface, or even exposed to the ground, which is relatively easy for people to find. There are also some coal seams that are relatively thin and not large in area, so they have no mining value, and there is no updated theory about the formation of coal.

Introduction

It is an undeniable fact and basis that coal is indeed formed by the remains of plants through a systematic evolution, which is a turbulent truth, as long as you look closely at the coal, you can see the traces of plant leaves and rhizomes; If you cut the coal into thin slices and look at it under a microscope, you can find very clear plant tissues and structures, and sometimes there are things like tree trunks preserved in the coal seams, and in some cases there are complete insect fossils wrapped in the coal seams.

Under normal temperature and pressure on the surface, the plant remains accumulated in stagnant water bodies are transformed into peat or saprolite by peatization or saprolite. After peat or saprolite, it sinks to the depths of the underground due to the decline of the basin basement, and is transformed into lignite by diagenesis. When the temperature and pressure gradually increase, it is transformed into bituminous coal to anthracite through metamorphism.