Fill in the blanks and complete the story.
About 300 million years ago, the earth had dense ………… in low lying wetland areas. Due to natural processes like………….. these forests got buried under the…………. As more …………….. deposited over them, they were compressed. The ………. also rose as they sank deeper and deeper. Under high …………….. and high …………… , dead plants got slowly converted into coal.
About 300 million years ago the earth had dense forests in low-lying wetland areas. Due to natural processes, like floods, these forests got buried under the soil. As more soil was deposited over them, they were compressed. The temperature also rose as they sank deeper and deeper. Under high pressure and high temperature, dead plants got slowly converted into coal.
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- Name the process by which plant material (or vegetation) buried deep under the earth was slowly converted into coal.
- The slow process by which the large land plants and trees buried deep under the earth have become coal is called:carbonationcarburetioncarbonisationcarbocation
- Seema visited a Natural Gas Compressing Unit and found that the gas can be liquefied under specific conditions of temperature and pressure. While sharing her experience with friends she got confused. Help her to identify the correct set of conditions(a) Low temperature, low pressure(b) High temperature, low pressure(c) Low temperature, high pressure(d) High temperature, high pressure
- Write True/False against the following statements.(i) Oxygen in air is an exhaustible natural resource.(ii) Resources which are present in unlimited quantity in nature are called exhaustible natural resources.(iii) Wildlife is an exhaustible natural resource.(iv) Under high temperature and pressure, dead plants get slowly converted to coal.(v) CNG is less polluting fuel than petrol and diesel.
- Classify the following as exhaustible and inexhaustible natural resources- air, sunlight, water, forests, wildlife, coal.
- Some natural resources are given below. Classify them into the exhaustible and inexhaustible natural resources.Air, coal, natural gas, sunlight, petroleum, minerals, forests, oxygen
- Express the square numbers lying between 200 and 300 as the product of two consecutive natural numbers increased by 1 .
- The Fun They Had
- Few toffees were distributed among Ramesh, Suresh and Prakash. Ramesh got 3/8, Suresh got 1/ 2 and Prakash got 1/8 toffees of the total toffees .Who got the maximum toffees?
- Fill in the blanks.(a) The slow process of conversion of dead vegetation into coal is called __________.(b) Coal and petroleum are formed from the dead remains of organisms and are known as __________.(c) The black thick liquid with __________ smell is known as coal tar.(d) During the processing of coal to get coke, coal tar and __________ are also obtained.(e) The process of separating the various constituents of petroleum is known as __________.(f) Excessive burning of fossil fuels is a major cause of __________.
- Why are coal and petroleum categorized as natural resources? Given a reason as to why they should be used judiciously.
- Find the final X and Y when they are Altering under given condition in C++
- Fill in the Blanks:_________ fibre is used as substitute for natural wool.
- How long are the energy resources of the earth like coal, petroleum and natural gas expected to last?
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