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What is limestone ? Limestone : It is a calcareous sedimentary rock. Limestone or Calcium Carbonate is generally not soluble in water. But it gets readily dissolved in rainwater or acid solutions when it is transformed to Calcium Bicarbonate, which is not resistant to erosion and highly permeable. Surface water sinks underground through holes on the surface of the earth carved by solution actions of rainwater in Limestone regions. Limestone may be white, grey, green or blackish in colour. It is used as a raw material in making cement and in the iron and steel industry.  What is sandstone? Sandstone : It is a sedimentary rock rich in sand. It is resistant to erosion in spite of being highly porous and permeable. Architects use it in making epitaphs and monuments. It is yellow, orange, red, pink, white or grey in colour. Soil in regions dominated by Sandstone is saline and infertile. Many architectural wonders in India, like the Red Fort, the temples in Udaygiri-Khandagiri and K

  What is geothermal energy? Answer: It is a type of energy.The temperature of the earth's core waves outward. This thermal power is known as geothermal energy. Many countries of the world produce electricity from this thermal power. Iceland meets upto 30% of the total energy requirement from geothermal energy. The U.S.A produces highest amount of electricity in the world from geothermal energy. Electricity production from geothermal energy reduces the use of fossil fuel (coal, petroleum).

  An account to igneous rocks Granite: Continental crust is mainly formed of this Ba rock. It is composed of quartz, feldspar, mica and ro homblende and the colour of this rock varies from white, grey to pink. This is an impermeable rock. Granite is m very much resistant to erosion as it is heavy and very hard. Granite is coarse granied as the magma is cooled and solidified very slowly in the earths interior (diameter >3 mm). Landforms developed on the regions of granite rock are generally rounded and domal.

What is the Rock cycle?   Answer: Magma from there underneath atmosphere Can erupt through a weak part of the earth crust. Gradually they cool down to from the igneous rock. The igneous rock eroded 1 by different agents like-river wind glacier, and carried by these agents to the sea, these eroded material deposit layer by layer in the sea and form sedimentary rocks. When igneous and sedimentary rocks, come under huge temperature and pressure, Chemical reaction, they transform into Metamorphic rock when the earth movement occurs, these rocks. are brought inside the earth. Due to heat there melt. to form magma Magma again. to From, the igneous rock again. come outside thus starting From the igneous rock again back to it is called rock cycle 

                Basic properties of life class="separator" style="clear: both; text-align: center;"> 1.  Respond to stimuli The power to respond to stimulus is known as irritability. It may take place due to the change of both external and internal environment. For example, the leaflets of Mimosa pudica (sensitive plant) close up in pairs and droop down when touched. 2.  Growth   Young organisms grow in size and attain maturity. When the rate of anabolism exceeds the rate of catabolisms new organic substances are added to the protoplasm as a result the living cell increases in size and the organism grows. 3.  Metabolism In the protoplasm of a living cell many of the chemical reactions are always taking place. The changes that occur due to these reactions are required for the 1.1.1 Concept about Orig maintenance of body functions. The sum total of all these biochemical reactions taking place within a living cell is called metabolism. 4.  Respiration Respir

 General knowledge  1. Who drafted the Indian Constitution? Ans:-  Drafting Committee of the Constituent                       Assembly.

 Life and it's diversity 

 How to make your own volcano - Take one cardboard, a long thin can, plastic tapes, newspaper, gum, sand or ash, coloured paper, a little amount of vinegar and soda water. Stick the can to the middle of the card board with the help of tape. Make a cone by pasting that newspaper on all sides of the can. Then cover the outside of the volcano with aluminium foil or coloured paper. You may spread sand/ash on it with gum. Your volcano is more or less ready. Now for volcanic eruption pour some vinegar and soda water into the can. Give some red colour into it. You can watch red lava is coming out from your volcano.

 What is density ? Density of a matter is its mass per unit volume. It is measured by the measure of its mass contained in one cubic centimetre of its volume. Density of a matter gives us an idea of how close, or how far apart, its molecules are. An iron plate feels heavier than an aluminum plate of the same volume, simply because iron is denser than aluminum.

   disaster management :-