Lakhmir Singh and Manjit Kaur Science solution: “Rock, Minerals & Soil” Chapter 07. Here you get easy solutions of Lakhmir Singh and Manjit Kaur Science solution Chapter 07 . Here we give Chapter 07 all solution of Class 5. Its help you to complete your homework.
- Board – CBSE
- Text Book – SCIENCE
- Class – 5
- Chapter – 07
Objective Type Questions:
(1) (a) The three layers of the earth are ______, ______ and ______
(b) _______ are used in making Jewellery.
(c) ______ is formed from shells.
(d) _______ rock is the transformation of a certain type of rock into another type of rock.
(e) ______ is formed from old decayed plants.
(f) The bottom layer of soil is called ______
Ans. (a) Core; Crust; Mantle (b) Precious metals (c) Limestone (d) Metamorphic (e) Coal (f) Bedrock
(2) Choose the correct answer.
(a) Rock used by dentist to polish teeth
(b) The rock formed when pebbles and gravel get cemented together –
(c) Rock used in making cement –
(d) Rock formed from granite which has got different types of stripes
(e) Non – Metallic Mineral formed from dead plants and animals
(3) True / False
(b) False (Non metallic minerals can be in the form Solid, Liquid or gas)
(c) False (Marble is a metamorphic rock made from the sedimentary rock)
(4) Give one word for the following
(5) (a) Name: Pumice
Uses: Dentist use the powder of this stone to polish teeth.
(b) Name: Quartzite.
Uses: – Making of statues, Jwellery, and ornaments Quartzite is used.
(c) Name: Gneiss
Uses: Gneiss is used as a building stone.
(d) Name: Obsidian
Uses: It is used for making of Jewellery.
Subjective Type Questions:
(6) (a) How is an igneous rock formed?
Ans. The core is the innermost layer of earth and is made of molten lava which is a hot liquid. When this liquid lava flows out on the surface of the earth and cools down it become solid rock. This solid rock is called igneous rock.
(b) How is petroleum used in gaseous form? Mention any two uses of petroleum.
Ans. Petroleum is used in gaseous form as CNG (Compact Natural Gas).
Two uses of Petroleum,:-
(i) Petroleum is used for making petrol
(ii) It is used for create Diesel.
(c) Why should we use our resources judiciously? Mention two ways in which we can use our resources carefully?
Ans. This is because, Minerals take thousands of years to be made. It cannot be produced by man so it is imperative for us.
Two ways in which we can use our resources carefully:-
(i) Keeping the vehicles in good condition so that they use less fuel.
(ii) adopt more ways to use solar or wind energy.
(d) How are metamorphic rocks forms?
Ans. It is formed wither by intense heating up or squashing of the earth’s crust.
(e) What is soil? Mention the three types of soil.
Ans. The uppermost layer of the Earth that supports life and provides food for all is called soil.
The three types of soil are:- Sandy soil, Clayey soil and Loamy soil.
(f) What is soil erosion?
Ans. The wearing away of soil from the earth surface by wind or water called Soil erosion.
(g) How is coal formed? Mention three uses of coal.
Ans. Coal is formed when forests are buries underground, due to heat and pressure. They change into a dark substance formed coal.
Uses of Coal:-
(i) Man using coal in his iron.
(ii) Coal is used for electricity generation in thermal power plant.
(iii) Coal is used for cooking.
(h) Explain the three layers of soil.
Ans. The three layers of soil are:- Bedrock, Subsoil & Topsoil.
Bedrock: At the bottom are the big pieces of rocks are called bed rock.
Subsoil: The soil above the bedrock called subsoil. Which has minerals and some amount of brownish black material formed when plants and animals decay called humus.
Topsoil: The topmost layer is called top soil.
Next Chapter Solution Link:
Force, Machine And Energy Ch. 11 Solution