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Yogita Ingle 6 years, 5 months 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.
a) 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.
b)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.
c) 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.
d) 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.
e) 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 Prashant Bhargava 6 years, 5 months ago
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Yogita Ingle 6 years, 5 months ago
A mixture may contain one or more unwanted substances which may be harmful. These impurities are harmful for our health so, we need to separate different components of a mixture. Examples: Pebbles are separated from rice and pulse. Petrol, diesel, kerosene, etc. are obtained from crude oil by a method called distillation.
Azka Aman 6 years, 5 months ago
Posted by Deep Narayan Chaudhari 6 years, 5 months ago
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Yogita Ingle 6 years, 5 months ago
No, all living beings do not need the same kind of food. Some animals eat only plant products called as herbivores. Some animalseat only other animals. They are called carnivores. Some other animals eat both plants and animals called omnivores.
Posted by Nimesh Prasad 6 years, 5 months ago
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Yogita Ingle 6 years, 5 months ago
- Despite the fact that for thousands of years people have been using the periodic table with phosphorus (P) in it, it was not until 1669 that it was secluded and termed by a chemist named Brand.
- Phosphorus is an element that one will under no circumstances find freely in our environment. It is extremely reactive.
- There are four forms of phosphorous usually used these days: white, black, red, and violet.
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Manvi Mishra 6 years, 5 months ago
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Yogita Ingle 6 years, 5 months ago
Crystallisationis a process that separates a pure solid in the form of its crystals from a solution. The crystallisation method is used to purify solids.
For example, the salt we get from sea water can have many impurities in it. To remove these impurities, the process of crystallisation is used.
Posted by Jnanamrutha.N Ammu 6 years, 5 months ago
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Echchha? Sharma 6 years, 5 months ago
Soumya Choudhury 6 years, 5 months ago
Yogita Ingle 6 years, 5 months ago
Soluble substances are those which disappear when mixed with water. Eg: salt, ethanol and sugar are examples of soluble substances
Posted by Jnanamrutha.N Ammu 6 years, 5 months ago
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Yogita Ingle 6 years, 5 months ago
Properties of Materials
- Transparency/Opaque: The amount of light material allow passing through it is transparency of the material. The maximum amount of light to pass through the material, therefore, they are transparent materials. Examples: Plastic, Air, and Glass.
Translucent materials are, which that only allow light to pass through them partially. Examples: Oiled paper, Coloured syrup, and some sheer materials. An opaque object is the materials are, which don’t allow any light to pass through them. Examples: Wood, Cardboard, and Metals - The appearance of the Material: The look, feel, texture in addition to lustre, colour and quality defines the property of appearance of the material.
- Soluble/Insoluble: The nature of the material to completely dissolve in water and therefore termed as soluble material. Materials are completely dissolvable in water, therefore, they are soluble materials. Examples: Lemon juice, Sugar and Salt. materials don’t completely dissolve in water, they form a thin film over the surface of the water, therefore, they are iron rods and copper wires.Examples: Oil, Kerosene and Sawdust.
Saina Kashmaya 6 years, 5 months ago
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Uttam Kumar 6 years, 5 months ago
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Uttam Kumar 6 years, 5 months ago
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Sia ? 6 years, 5 months ago
An eclipse is the result of either an occultation (completely hidden) or a transit (partially hidden). The term eclipse is most often used to describe either a solar eclipse, when the Moon's shadow crosses the Earth's surface, or a lunar eclipse, when the Moon moves into the Earth's shadow.
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Yogita Ingle 6 years, 5 months ago
Decantation: This process is used after sedimentation. The upper layer; which contains water is slowly poured out from the container. It leaves the sediment behind.
Posted by Santosh Shaw 6 years, 5 months ago
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Yogita Ingle 6 years, 5 months ago
Types of Joints
- Fixed joints: The joints where no movement of bones is possible are called fixed joint. The joints in the skull bone (cranium) are examples of fixed or immovable joints.
- Moveable joint: Movement is possible in these joints. There are two types of movable joints:
- Freely movable joints and
- Partially movable joints.
There are four types of movable joints in the body; which are as follows:
- Ball and socket joint: In this joint the rounded end of one bone fits into the cavity (hollow space) of another bone. It permits movement in all directions. The joints between shoulder and the upper arm is an example of ball and socket joint. Similarly, the joint between thigh and hip is an example of ball and socket joint.
- Pivot Joint: This type of joint allows movements in many planes, viz. up and down, side to side movements. The joint between the skull and the vertebral column is an example of pivot joint.
- Hinge joint: This joint is similar to the hinges in a door. This joint allows movement only in one plane and only up to 1800. The knee joint and elbow joint are examples of hinge joint.
- Gliding joints: The movement in this joint happens due to sliding of bones over one another. Joints between the rings of the backbone are examples of gliding joint. The wrist joint is also an example of gliding joint.
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Sia ? 6 years, 5 months ago
Separating funnel is a device or an instrument which separates two immiscible liquids with varying densities.
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Yogita Ingle 6 years, 5 months ago
Neurons are nerve cells which are the functional units of the nervous system. The three main parts of a neuron are dendrite, cell body and axon.
Structure of neuron.
Functioning of its three parts.
Dendrite: It detect information and conducts the messages towards the cell body.
Cell body: It contains nucleus, mitochondria, and other cell organelles. It maintains the growth of the cell.
Axon: It conducts messages away from the cell body and pass to the next neuron.
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Narayan Mukherjee 6 years, 5 months ago
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