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a complex mixtureSoil covers most of the land surface of the earth in a thin layer, ranging from a few centimetres to several metres deep. It is composed of rock and mineral particles of many sizes mixed with water, air, and living things, both plant and animal, and their remains.Soil teems with lifeAll soil is full of life, and good soils are teeming with it. Plants and animals help keep the soil fertile. Plant roots tunnel through the soil and break it up, and decaying plants form humus. Burrowing animals mix the soil; the excrete of animals contribute nutrients and improve soil structure.Only a fraction of land is arableMan's chief interest in soil is for agriculture, but not all soils are suitable for farming. The total land area of the world exceeds 13 billion hectares, but less than half can be USED for agriculture, including grazing. A much smaller fraction - about 1.4 billion hectares - is presently suitable for growing crops. The rest of the land is either too wet or too dry, too shallow or too rocky. Some is toxic or deficient in the nutrients that plants require and some is permanently frozen .Europe, Central America, and North America have the highest proportion of soils suitable for farming, although a number of the more developed countries seem intent on paving over much of their best farmland with roads and buildings. The lowest proportions of arable soils are in North and Central Asia, South America, and Australia. The single most serious drawback to farming additional land is lack of water. Erosion destroyed civilizationsCivilizations began where farming was most productive. When farm productivity declined, usually as a result of soil mismanagement, civilizations also declined - and OCCASIONALLY vanished entirely.The worst threat is erosionThe most serious form of soil degradation is from accelerated erosion. Erosion is the washing or blowing away of surface soil, sometimes down to bedrock. While some erosion takes place without the influence of man, the soil is lost so slowly that it is usually replaced through natural processes of decay and regeneration. Soil loss and soil creation of new soil stay in balance. Bad farming encourages soil lossUnfortunately, many bad farming and forestry operations encourage erosion. Erosion accelerates when sloping land is ploughed and when grass is removed from semi-arid land to begin dryland farming. It accelerates when cattle, sheep and goats are allowed to overgraze and when hillside forests are felled or cut indiscriminately. While there are isolated instances of deserts being reclaimed by irrigation or of new forests being planted, man, in the majority of instances, degrades the soil when he begins agricultural operations.The mechanics of soil erosion are fairly WELL understood today by conservationists and by many farmers. Erosion from water proceeds in three steps: (1) soil particles are loosened by the bomb-like impact of raindrops or the scouring action of runoff water; (2 ) the detached particles are moved down the slopes by flowing water; and (3) the soil particles are deposited at new locations, either on top of other soil at the bottom of the slope or in ponds or waterways. Rainfall energy variesStill another factor in soil erosion from water is the erosivity of the rain its intensity and duration. In many parts of Europe, where rains are relatively gentle, erosion is rarely severe. In most tropical countries and in parts of the United States, however, rains are much more intense and occasionally torrential. Much more rain falls per hour, and as rainfall intensity increases, the size of individual raindrops also increases. A tropical raindrop strikes unprotected soil with more force than raindrops in Europe, dislodging more soil. The flow of water down a slope is also greater, and the net result is more soil eroded and moved downhill. Why some soils erode easilyAnother factor in water erosion is the character of the soil itself. Some soils tend to erode easily from the action of rain and runoff; others are REMARKABLY resistant, even in heavy downpours. The susceptibility of different kinds of soils to erosion under cultivation varies widely. Perhaps the most important factor is the relative ability of the soil to absorb rainfall rapidly. Certain soils of the tropics absorb rainfall so rapidly that there is little erosion, even on steep slopes. Organic soils soak up waterOrganic matter in soil can absorb and STORE much more water than can inorganic fractions. It acts like a sponge, taking up water and releasing it as required by plants. It also helps bind soil particles into larger aggregates, or crumbs. Soils with this kind of structure are very resistant to erosion. Conversely, nearly all soils containing little or no organic matter are very susceptible to erosion.

please mark as brainlist...Speed is a scalar quantity that REFERS to "how fast an object is moving." Speed can be thought of as the rate at which an object covers distance. A fast-moving object has a high speed and covers a relatively large distance in a short amount of time. Contrast this to a slow-moving object that has a low speed; it covers a relatively small amount of distance in the same amount of time. An object with no movement at all has a zero speed.Velocity is a vector quantity that refers to "the rate at which an object changes its position." Imagine a person moving rapidly - one step forward and one step BACK - ALWAYS returning to the original starting position. While this might result in a frenzy of activity, it would result in a zero velocity. Because the person always returns to the original position, the motion would NEVER result in a change in position. Since velocity is defined as the rate at which the position changes, this motion results in zero velocity.

Safe response to EMERGENCIES for the benefit of casualties, BYSTANDERS and rescuers. Securing the emergency SITE to reduce further harm to the casualty. ... Safely MOVING the casualty, minimising pain and helping STABILISE the condition.

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Start by identifying the OXIDATION state for each of the element:+2Fe+6S−2O4→+3Fe2−2O3++4S−2O2++6S−2O3−NOT BALANCEDOnly three of the four chemicals- FeSO4 , Fe2O3 , and SO2 are directly involved in the redox reaction.The oxidation state of iron Fe has increased from+2 in +2Fe+6S−2O4 to+3 in +3Fe2−2O3 by oneand therefore Fe is oxidized.The oxidation state of sulfur S has declined from+6 in +2Fe+6S−2O4 to+4 in +4S−2O2 by TWOAND therefore some of the sulfur atoms have been reduced.The total increases in oxidation numbers shall be the same as the sum of decreases in oxidation numbers in a balanced redox reaction.The oxidation NUMBER increases by 1 for each mole of Fe atom oxidized and decreases by 2 for each mole of S oxidized.Therefore for each mole of S reduced, two moles of Fe atoms shall be oxidized.Note that sulfur dioxide, +4S−2O2 , is the only species containing sulfur atoms of oxidation state +4 . Thus all of the reduced sulfur atoms would end up in SO2 .The number of moles of sulfur atoms reduced shall therefore equal to the number of SO2 molecules produced. This number would be slightly smaller than that of +2Fe+6S−2O4 given that sulfur atoms that were not reduced GOT eventually into +6S−2O3 .Add coefficients 2 and 1 in front of FeSO4 and SO2 , respectively:2l+2Fe+6S−2O4→+3Fe2−2O3+1l+4S−2O2++6S−2O3−NOT YET BALANCEDDeduce coefficients for the rest of the species based on the conservation of iron and sulfur atoms.2l+2Fe+6S−2O4→1l+3Fe2−2O3+1l+4S−2O2+1l+6S−2O3−BALANCEDTake coefficients " 1 " out of the expression:2lFeSO4→Fe2O3+SO2+SO3

Explanation:Valentina Tereshkova On June 16, 1963, aboard VOSTOK 6, Soviet Cosmonaut Valentina Tereshkova becomes the first woman to TRAVEL into space. After 48 orbits and 71 hours, she returned to EARTH, having SPENT more time in space than all U.S. ASTRONAUTS combined to that date.

tion:54*5/1815 METER/ SECOND will be the ANSWER

can I tell the answer EXPLANATION:PLEASE MARK as BRAINLEAST

COExplanation:CO (CARBON monoxide) combines with haemoglobin and forms carboxy haemoglobin which can even CAUSE death

Not ABLE to understand the QUESTION PLEASE type it again for BETTER UNDERSTANDING

gh energy PARTICLES on the liquid SURFACE may have enough energy to escape the INTERMOLECULAR forces of attraction of the liquid and become a gas. This is CALLED EVAPORATION. Evaporation only happens on the surface while boiling happens throughout the liquid. ... This process is called boiling.

he first case the resistors are in series and in the SECOND case the resistors are in parallel. b) resistors in parallel are used for domestic PURPOSE. To supply equal amount of ENERGY to all appliances.c) in first case by adding the resistance and in second case by formula GIVEN in ncert bookExplanation:mark as brainliest answer

I have ALREADY GIVE U the ANSWER u can CHECK

It refers to a plant COMMUNITY which has grown naturally without human aid and has been left undisturbed by humans for a LONG time (also called as virgin VEGETATION). Cultivated crops and FRUITS, orchards form part of vegetation but not natural vegetation.

7Explanation:it is CORRECT ANSWER KEY

The condition of the polish under NAZISM can be explained as follows :Polish were TREATED subhuman and they were CLASSIFIED as UNDESERVING for any kind of humanity. They were captured and forced to work as slave labor.When Poland was occupied, Polish were forces to leave their home.Polish intelligentsia was killed in order to keep Polish people devoid of any kind of spirituality and guidance. Polish kids went through the race tests, if they passed they were given

So BIG Question, have you PRINTED whole book?PLEASE ask 1 Questions

Cl is the most REACTIVE halogenExplanation:PLEASE follow me and MARK as BRAINLIEST also thank my answer

n an accident OCCURS, it may take some time for the doctor to reach or to take a wounded person to the hospital. In such a case immediate HELP given on the spot is CALLED first AID.

DUE TO INERTIAExplanation:IT IS NEWTONS FIRST LAW OF MOTION. IT STATES THAT IF AN OBJECT IS AT REST IT STAYS AT REST AND IF IT IS IN MOTION IT STAYS IN MOTION AND DOES NOT WANT TO CHANGE ITS STATE OF MOTION.I HOPE THIS ANSWERS YOUR QUESTION. YOU CAN ALSO STUDY THE OTHER 2 LAWS OF MOTION. IF YOU ARE SATISFIED WITH THE ANSWER PLEASE DO MARK ME AS BRAINLIEST!ENJOY STUDYING

ray strikes CONCAVE or convex mirrors OBLIQUELY at its pole, it is REFLECTED obliquely. ... When a ray, passing through focus strikes concave or convex mirrors, the reflected ray will pass parallel to the principal AXIS.

We can separate colours using filter PAPER by CHROMATOGRAPHY.....EXPLANATION:...PLS mark as the BRAINLIEST

जब हम अपेक्षाओं के माध्यम से लक्ष्य निर्धारण की बात करते हैं तो दो अहम पहलुओं को ध्यान में रखने की जरूरत होती है। एक अपेक्षा विद्यार्थियों को स्कूल से होती है। इसी तरह स्कूल की भी कुछ अपेक्षाएं विद्यार्थियों से जुड़ी होती हैं। हालांकि उनके बीच की कड़ी में शिक्षकों सहित अभिभावकों को माना जाता है, मगर यह भी सच्चाई है कि इन सभी की अपेक्षाएं एक दूसरे से जुड़ी हैं, जिसके जरिये सभी अपना लक्ष्य निर्धारण करते हैं। विद्यार्थी जीवन में बच्चों का लक्ष्य स्कूल से अच्छी शिक्षा प्राप्त करना होता है, वहीं स्कूल में शिक्षकों का लक्ष्य बच्चों को बेहतर शिक्षा प्रदान करना है। स्कूल में आने वाले विद्यार्थियों से अपेक्षा की जाती है कि वह एकाग्र हों और व्यक्तित्व के विकास के लिए विभिन्न गतिविधियों में शामिल हों। अनुशासन का भी बच्चों के जीवन में बहुत बड़ा हाथ होता है। अगर वे अनुशासन को अपने जीवन और नैतिकता को व्यवहार में उतार लेंगे, तो उन्हें जीवन में आगे बढ़ने से कोई नहीं रोक सकता।

tion:Which of the following has more inertia ? Explain :(a) A rubber ball and stone of the same size. (b) A BICYCLE and a train. (c) A FIVE RUPEE coin and a ONE rupee coin.Please ANSWER it fast.

Sustainable management takes the concepts from sustainability and synthesizes them with the concepts of management. Sustainability has three BRANCHES: the ENVIRONMENT, the needs of present and future GENERATIONS, and the economy. Using these branches, it creates the ability of a SYSTEM to thrive by maintaining economic viability and also nourishing the needs of the present and future generations by limiting resource depletion. From this definition, sustainable management has been created to be defined as the application of sustainable practices in the categories of businesses, agriculture, society, environment, and personal life by MANAGING them in a way that will benefit current generations and future generations.Explanation:

hard SMOOTH SURFACE has led to TOTAL internal REFLECTION.

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WE SHOULD TAKE ONLY THAT MUCH FOOD WHICH WE CAN EAT .....................NOT MORE THAN THAT EXPLANATION:

what I don't UNDERSTAND your QUESTION

Explanation:Newton's first LAW of motion states that an object at rest remains at rest and an object in motion remains in motion with the same velocity unless ACTED upon by what we call an unbalanced force. LET's break this law down by defining some key TERMS. Velocity is the speed of an object in a specified direction. An unbalanced force is an EXTERNAL force that changes the motion of an object. When an object is at rest or moving at a constant velocity, all the forces acting on it are balanced.