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Gaurav Seth 7 years, 1 month ago
Hectare (ha) A hectare is a unit of area equal to 10,000 square meters. Usually used to measure land. Example: a square that is 100 meters on each side has an area of 1 hectare.
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Meghna Thapar 6 years, 1 month ago
Oxygen is the chemical element with the symbol O and atomic number 8. Oxygen is a colorless, odorless, tasteless gas essential to living organisms, being taken up by animals, which convert it to carbon dioxide during respiration. It is produced by plants during the process of photosynthesis.
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Yogita Ingle 7 years, 1 month ago
The cyclic movement of water from the atmosphere to the Earth and back to the atmosphere through various processes is called as water cycle.
Different steps of water cycle include evaporation, transpiration, condensation, precipitation and surface run-off.
Evaporation - The water present on the surface of oceans evaporates by the sun’s heat. This process of conversion of water from liquid state to vapour state is called evaporation. Evaporation also takes place from wet clothes, fields, ponds, lakes and rivers.
Transpiration - Plants take in water from the soil to prepare their own food and also for other life processes. They release excess water into air in the form of water vapour by the process of transpiration.
Condensation - The evaporated water is carried away by warm air. As the warm air moves higher from the surface of the Earth, it starts to cool down. This water vapour condenses to form tiny water droplets which float in air to form clouds or fog.
Precipitation - All these droplets collect to form bigger drops of water. Bigger water drops come down ads rain by the process of precipitation. If the air is too cold, the water drops can become snow or hail and may settle on the top of a mountain. When these snow or hail melts, they can become part of a river or a stream.
Surface run-off – Some amount of rain water is absorbed by the soil and settles down as ground water. Most of the rain water flows down the hills and mountains to collect into rivers, lakes or streams. Rain also washes away the topmost layer of the soil into water bodies.
Posted by Topper At All 7 years, 1 month ago
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Posted by Nitu Dube 7 years, 1 month ago
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Yogita Ingle 7 years, 1 month ago
Evaporation is the process in which a material changes from liquid to gas phase, upon addition of heat. An example is the evaporation of water to steam, when we heat it. Opposite of evaporation is condensation, a process in which a material changes from gas phase to liquid phase.
Nitu Dube 7 years, 1 month ago
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Waste which cannot be decomposed by biological process is known as “Non-biodegradable wastes”. Most of the inorganic waste is non-biodegradable. Non-biodegradable wastes which can be recycled are known as “Recyclable waste” and those which cannot be recycled are known as “Non-recyclable waste”.
Posted by Nisha Kukreja Nisha Kukreja 7 years, 1 month ago
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Yogita Ingle 7 years, 1 month ago
In scientific terms, a food chain is a chronological pathway or an order that shows the flow of energy from one organism to the other. In a community which has producers, consumers, and decomposers, the energy flows in a specific pathway. Energy is not created or destroyed. But it flows from one level to the other, through different organisms.
A food chain shows a single pathway from the producers to the consumers and how the energy flows in this pathway. In the animal kingdom, food travels around different levels.
Posted by Shanmuga Sundaram 7 years, 1 month ago
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Yogita Ingle 7 years, 1 month ago
Around 70 percent of your bones are not living tissue, but hard minerals like calcium. The outside of the bone is called the cortical bone. It's hard, smooth, and solid. Inside the cortical bone is a porous, spongy bone material called the trabecular or concellous bone.
Posted by Life'S Tune 7 years, 1 month ago
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Yogita Ingle 7 years, 1 month ago
There are many ways that animals are adapted to live in dry conditions. First, a decrease in surface area reduces water loss by minimising sweating. They may also have long eyelashes to keep dust out of the eyes. They are often nocturnal, meaning that they are awake at night, which is cooler and minimizes sweat loss.
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Geetanand Yadav/ Rao Sahab??????✌??? 7 years, 1 month ago
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Geetanand Yadav/ Rao Sahab??????✌??? 7 years, 1 month ago
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Yogita Ingle 7 years, 1 month ago
Magnet was discovered by an ancient Greek shepherd; named Magnes. Once; while he was fiddling with his stick, the metallic end of the stick got stuck with the rocks. Those rocks contained the natural magnet, magnetite. The story of magnetite spread far and wide. Some people believe that magnetite was discovered at a place called Magnesia.
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Yogita Ingle 7 years, 1 month ago
Some common properties are as follows:
- Colorless and odourless: Air generally has no color or odour. It is an invisible matter that can only be felt. All living things breathe air for their survival. Moving air is called the wind.
- Occupy space: It is a mixture of different gases. Hence, like every other matter, they also occupy space. On blowing, a balloon expands because the air being blown into it fills in the empty space.
- Air exerts pressure: It has weight, and the pressure exerted by the weight of air is known as air pressure. Due to gravity, this mixture of gases near the surface is denser than at high altitudes. This is why the gaseous atmosphere in mountains is thinner than that at the surface.
- Expansion: Another property is its expanding property. On heating, it expands and occupies more space. More it expands, more it becomes thinner. Hence, the pressure of warm wind is lower than that of cold wind.
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Yogita Ingle 7 years, 1 month ago
Compost is organic matter that has been decomposed in a process called composting. This process recycles various organic materials otherwise regarded as waste products and produces a soil conditioner (the compost). Compost is rich in nutrients.
Posted by Mangi Lal Mali 7 years, 1 month ago
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Reena Gupta 7 years, 1 month ago
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