Welcome to the Chapter 5 - Water, Class 7 Social Science - Our Environment (Geography) NCERT Solutions page. Here, we provide detailed question answers for Chapter 5 - Water. The page is designed to help students gain a thorough understanding of the concepts related to natural resources, their classification, and sustainable development.
Our solutions explain each answer in a simple and comprehensive way, making it easier for students to grasp key topics Water and excel in their exams. By going through these Water question answers, you can strengthen your foundation and improve your performance in Class 7 Social Science - Our Environment (Geography). Whether you’re revising or preparing for tests, this chapter-wise guide will serve as an invaluable resource.
(i) Precipitation is defined as the deposition of moisture from the atmosphere onto the earth’s surface. This may be occur in the form of rain, hail, frost fog, sleet or snow etc.
(ii) The process by which water changes continuously change its form and circulates between oceans, atmosphere and land is called as the water cycle.
(iii) Factors affecting the heights of the waves are as follows:
- Speed of wind
- Duration of wind
- Distance the wind blows over water
- Earthquakes
- Volcanic eruption
- Underwater landslides
(iv) Factors affecting the movement of ocean water are as given below:
- Temperature
- Earthquake or volcanic eruption
- Gravitational pulls of the sun and the moon
- Underwater landslides
- Rotation of the earth
(v) The rhythmic rise and fall of ocean water twice a day is known as tide. Tides are caused due to the gravitational pull that is exerted by the sun and the moon on the earth’s surface.
(vi) Ocean currents are defined as streams of water flowing constantly on the oceanic surface in definite directions.
(i) Oceanic water is salty because it obtains large amount of dissolved salts. Most of the salt is sodium chloride or contains the common table salt that we eat.
(ii) The quality of water is deteriorating as reasons given below:
- Garbage that we throw in the river.
- Chemicals pollutes water that are released from industries.
- Residues of the harmful insecticides and pest resistant’s flowing in from the fields.
- Unburnt or half burnt corpses of men and animals thrown in water bodies.
(i) (a) water cycle
(ii) (b) equator
(iii) (a) tide
(i) Caspian sea (a) Largest lake
(ii) Tide (b) Periodic rise and fall of water
(iii) Tsunami (c) strong seismic water
(iv) Ocean currents (d) Streams of water mov