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NCERT Solutions Class 10 ideas | solutions, class, math books Students can find the NCERT Solutions for Class 10 Geography Chapter 3 � Water Resources here. These solutions contain the answers to all exercise questions. Answers are created by subject experts and are written from an examination perspective. Referring to these solutions will help students in scoring high marks during the exam. Jul 24, �� All CBSE Class 10 students can access NCERT Solutions for Geography Chapter 3 from here. We at CBSE Guide, offering Class 10 CBSE Geography Chapter 3 NCERT Solutions for free of cost. These NCERT Textbook Solutions for Class 10 Geography are prepared by the experts by matching the curriculum exactly. NCERT Solutions for Class 10 Geography is an important resource for board exam preparation. For most students, scoring marks in Geography is easy as 70 to 80 % of the questions appearing in exams are asked directly from NCERT Class 10 Geography textbook.
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Production of goods in large quantities after processing from raw materials to more valuable products is called manufacturing. Manufacturing belongs to secondary sector in which the primary materials are processed and converted into finished goods.

Importance of manufacturing industries for India: It helps in modernizing agriculture, reduces heavy dependence on agricultural income by providing [�]. Rocks are combinations or aggregates of minerals in varying proportions. Some rocks consist of a single mineral, e. India is an agricultural country because of the following reasons: Two-third of its population is engaged in agricultural activities. Agriculture is a primary activity and produces most of the food and food grains.

It produces raw materials for our various industries, e. Agricultural products, like tea, coffee, spices are exported and [�]. Answer: a P-waves. Question 1 ii.

Which one of the following is a direct source of information about the interior of the earth? Question 1 iii. Which type of volcanic eruptions have caused Deccan Trap formations? Answer: b Flood.

Question 1 iv. Which one ofthe following describes the lithosphere? Answer: b Crust and upper mantle. Question 2 i. What are body waves? Answer: Body waves are generated due to the release of energy at the focus and move in all directions travelling through the body of the earth. Therefore, it has been named as body waves. These are of two types: P-waves and S-waves. Question 2 ii.

Name the direct sources of information about the interior of the earth. Answer: Some of the direct sources are Question 2 iii. Why do earthquake waves develop shadow zone? Answer: Earthquake waves get recorded in seismographs located at far offlocations.

But there exist some specific areas where the waves are not reported. The study of different events reveals that for each earthquake, there exists an altogether different shadow zone. The shadow zone of S-wave is much larger than that of the P-waves. The shadow zone of S-waves is not only larger in extent but it is also a little over 40 per cent of the earth surface. Question 2 iv.

Briefly explain the indirect sources of information of the interior of the earth other than those of seismic activity.

Answer: Analysis of properties of matter indirectly provides information about the interior. Question 3 i. What are the effects of propagation of earthquake waves on the rock mass through which they travel? Answer: Earthquake waves are basically of two types: Body waves and surface waves.

Body waves are generated due to the r elease of energy at the focus and move in all directions travelling through the body of the earth. Therefore these are called body weaves. The body wraves interact with the surface rocks and generate new set of waves called surface waves.

These waves move along the surface. The velocity of waves changes as they travel through materials with different densities. The denser the material, the higher is the velocity. The direction of vibrations of S-waves is perpendicular to the wave direction in the vertical plane. Hence, they create troughs and crests in the material through which they pass. Surface waves are considered to be the most damaging waves. Question 3 ii.

What do you understand by intrusive forms? Briefly describe various intrusive forms. Answer: The lava that cools within the crustal portions assumes different forms.

These forms are called intrusive forms. Important intrusive forms are described below:. Question 1. How do we measure magnitude of earthquake? Answer: a Richter Scale. Question 2. How do we measure intensity of earthquake?

Answer: b Mercalli Scale. Question 3. Answer: c P-Waves. Question 4. Answer: a Asthenosphere. Question 5. What is the approximate depth of mantle? Answer: b km. Question 6. Core is made of which metals? Answer: d Nickel and Magnesium. Question 7. What is the density of the rocks between the adjoining line on mantle and core?

Answer: b 5 gm per sq cm. Question 8. What is the thickness of the crust? Answer: a 10 km to km. Question 9. What is the density of the rocks of mantle? Answer: a gm per sq cm. Question Crust and upper portion of mantle taken together is called: a Asthenosphere b Magma c Lithosphere d Core.

Answer: c Lithosphere. What is the mean thickness of oceanic crust? Answer: a 5 km. What is the mean thickness of continental crust? Answer: b 30 km. By which metals is core made of? Answer: Core is made up of nickel and iron. Name the deepest mine of the world. Answer: Gold mines in South Africa are as deep as 3 � 4 km.

How do we measure magnitude, of an earthquake? Answer: We measure magnitude of an earthquake using Richter Scale. What is the thickness of the crust in oceans, continents and mountains? Answer: The mean thickness of oceanic crust is 5 km whereas that of the continental is around 30 km.

The continental crust is thicker in the areas of major mountain systems. It is as much as 70 km thick in the Himalayan region. What do you mean by dykes? Answer: When the lava makes its way through cracks and the fissures developed in the land, it solidifies almost perpendicular to the ground. It gets cooled in the same position to develop a wall-like structure. Such structures are called dykes. What do we get to know about the interior of the earth through mining?

Answer: We get to know through the mining activity that temperature and pressure increase with the increasing distance from the surface towards the interior in deeper depths.

Moreover, it is also known that the density of the material also increases with depth. What do you mean by gravitational anomaly? Answer: The difference in readings from the expected values is called gravity anomaly. Gravity anomaly give us information about the distribution of mass of the material in the crust of the earth.

What do you mean by caldera? They are usually so explosive that when they erupt they tend to collapse on themselves rather than building any tall structure. The collapsed depressions are called calderas. When can an earthquake cause tsunami? Answer: An earthquake can take form of tsunami if its epicentre is below ocean and its magnitude is very high. An earthquake of magnitude more than 5 on Richter scale can prove to be very dangerous.

What are different types of forces? Answer: There are two types of forces Name the interior most part of the earth. What is its depth? Answer: Core is the interior most part of the earth. Its depth is between km to km. What is a volcano? What are intrusive forms? What are batholiths? Answer: A large body of magmatic material that cools in the deeper depth of the crust develops in the form of large domes. Batholiths are the cooled portion of magma chambers. What do you mean by hypocentre?

Answer: The point where the energy is released is called the focus of an earthquake, alternatively, it is called the hypocentre. What are surface waves? Answer: The body waves interact with the surface rocks and generate new set of waves called surface waves. These waves are very destructive. What do you mean by lapoliths? Answer: As and when the lava moves upwards, a portion of the same may tend to move in a horizontal direction wherever it finds a weak plane.

It may get rested in different forms. In case it develops into a saucer shape, concave to the sky body, it is called lapoliths.

What do you mean by lacoliths? Answer: These are large dome-shaped intrusive bodies with a level base and connected by a pipe-like conduit from below.

It resembles the surface volcanic domes of composite volcano, only these are located at deeper depths. What do you mean by phacoliths? Answer: A wavy mass of intrusive rocks, at times, is found at the base of synclines or at the top of anticline in folded igneous country. Such wavy materials have a definite conduit to source beneath in the form of magma chambers subsequently developed as batholiths. These are called the phacoliths. What do you mean by sills?

Answer: The near horizontal bodies of the intrusive igneous rocks are called sill or sheet, depending on the thickness of the material. The thinner ones are called sheets while the thick horizontal deposits are called sills. What is magma? Answer: As long as liquid rocks are in the upper portion of the mantle, it is called magma. Give meaning of mid-ocean ridge volcanoes. Answer: These volcanoes occur in the oceanic areas. There is a system of mid-ocean ridges more than 70, km long that stretches through all the ocean basins.

The central portion of this ridge experiences frequent eruptions. Write a note on composite volcanoes. Answer: These volcanoes are characterised by eruptions of cooler and more viscous lavas than basalt. These volcanoes often result in explosive eruptions. Along with lava, large quantities of pyroclastic material and ashes find their way to the ground.

This material accumulates in the vicinity of the vent openings leading to formation of layers, and this makes the mounts appear as composite volcanoes. Give a brief description of caldera. Their features are as follows:. Write a short note on flood basalt provinces. Answer: These volcanoes outpour highly fluid lava that flows for long distances. Explain the uppermost layer of the earth- crust. Answer: It is the outermost solid part of the earth. It is brittle in nature.

Explain the innermost layer of the earth- core. Answer: The Core is the innermost layer of the earth. Explain the middle layer of the earth- mantle. Answer: The Mantle: The portion of the interior beyond the crust is called the mantle. What are the effects of earthquake?

Answer: The following are the immediate hazardous effects of earthquake. What is earthquake? How do we measure its magnitude and intensity? Answer: An earthquake is shaking of the earth. It is caused due to release of energy, which generates waves that travel in all directions. Differentiate between Body waves and Surface waves? Answer: Main differences between body waves and surface waves are given below:. Explain different types of earthquakes.

Answer: The various types of earthquakes are What are different sources of information about the interior of the earth? Explain different types of earthquake waves. Answer: Earthquake waves are basically of two types body waves and surface waves. Explain how does shadow zone emerge. Use a diagram.

Answer: Earthquake waves get recorded in seismographs located at far off locations.

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