NCERT Solutions for Class 7 Social Science, NCERT Solutions for class 7 Geography, Our Changing Earth - Class 7th NCERT Solutions Geography, Chapter 3 - Our Changing Earth - NCERT - Class 7 – Geography, NCERT Solutions for Class 7th: Ch 3 Our Changing Earth Geography, Class VII Geography Notes and study material for Our Changing Earth, Social Science (Sst) –Geography - Class 7 (CBSE/NCERT) - Chapter 3 – Our Changing Earth - Questions and Answers/Notes/Worksheets – 1 Tags: CBSE Class 7 - Geography – Chapter 3 - Our Changing Earth Practice Pages, Extra Question and Answer based on NCERT for Class 7th, Social Science Geography, CBSE Grade VII free Worksheets PDF on Our Changing Earth, Geography Question bank on Our Changing Earth for seventh standard, True/False, Fill in the blanks, What are the major agents of erosion? Define loess? What is vent? What is a seismograph? What is the name of the scale used to measure earthquakes? Write some examples of coastal landforms? Write names of a few rivers of the world that form a delta. What are distributaries? Why do the plates move? How are beaches formed? What is erosion? What are meanders? What are Lithospheric plates? How much do lithospheric plates move in a year? What is a volcano? What are the two processes which wear away the landscape? How do glacial moraines form?
i. Mushroom rocks are found in deserts.
ii. Ox bow lakes are found in river valleys.
iii. Glaciers are “rivers” of ice.
iv. The highest waterfall is Angel Falls of Venezuela in South America.
v. Sudden movements in the earth interior are cause due to endogenic forces.
Ans. Water, wind and ice are the major agents of erosion.
Ans. When sand is deposited in large areas, it is called loess.
Ans. The narrow opening of a volcano is called vent.
Ans. An earthquake is measured with a machine called a seismograph.
Ans. The magnitude of the earthquake is measured on the Richter scale.
Ans. Examples of coastal landforms are sea caves, sea arches, stacks and sea cliff.
Ans. The river begins to break up into a number of streams called distributaries.
Ans. Plates move because of the movement of the molten magma inside the earth.
Ans. Beaches are formed when the sea waves deposit sediments along the shores.
Ans. Erosion is the wearing away of the landscape by different agents like water, wind and ice.
Ans. As the river enters the plain it twists and turns forming large bends known as meanders.
Ans. The lithosphere is broken into a number of plates known as the Lithospheric plates.
Ans. Lithospheric plates move around very slowly – just a few millimetres each year.
Ans. A volcano is a vent (opening) in the earth’s crust through which molten material erupts suddenly.
Ans. The landscape is being continuously worn away by two processes – weathering and erosion.
Ans. The material carried by the glacier such as rocks big and small, sand and silt gets deposited. These deposits form glacial moraines.