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Jan 25, 2023 · The Earth is a Unique Planet as it is the only planet that supports life in the solar system. Earth is also called a blue planet or water planet. It is the third planet from the Sun and the fifth largest planet in the solar system. Earth’s spherical shape is best represented using the globe. Man has constantly explored the four realms of the ...
- Ans: Earth is called a unique planet because it is the only planet that supports life. Earth has oxygen to breathe, moderate temperatures to sustai...
- Ans: Moon is the closest celestial body to our Earth.
- Ans: Earth is present at the right distance from the Sun. It is protected from harmful solar radiation by the ozone layer, and it is kept warm by a...
- Ans: Mars has only 0.13% of oxygen. It is dominated by a maximum amount of carbon dioxide.
- Ans: The microbes are the first life on the Earth.
Apr 22, 2019 · Our Changing Earth Class 7 Notes Social Science Geography Chapter 3. The lithosphere is broken down into a number of plates known as the Lithosphere plates. The movement of these plates causes changes on the surface of the earth. The forces that act in the interior of the earth are called endogenic forces, while the forces that work on the ...
Sep 8, 2016 · Study Material and Notes of Ch 3 Our Changing Earth Class 7th Geography. • The earth’s crust consists of several large and some small, rigid, irregularly-shaped plates which carry continents and the ocean floor, called Lithospheric plates. → These plates move around very slowly – just a few millimetres each year because of the movement ...
- Forces Causing Earth Movement
- Volcano
- Earthquake
- Major Landforms on Earth
- Erosion by River
- Erosion by Sea Waves
- Erosion by Glaciers
- Erosion by Wind
- Practice Questions
- Very Short Answer Type Questions
The earth's movements are determined by the forces causing them. These forces are of two types: endogenic forces and exogenic forces.Endogenic forces are forces that act on the interiors of the earth.Endogenous forces are divided into sudden forces and catastrophic forces. Sudden forces are the result of earthquakes, volcanoes, and landslides. The sudden force caused widespread destruction. Dis...Exogenic forces are forces that are experienced on the earth's surface.Volcanoes are the result of endogenic forces acting on the earth's interiors.It is a vent or crack in the earth's crust through which molten magma erupts suddenly.The Magma coming out from the earth's surface in the form of a volcano is called lava.It is found in a region where the plates either converge or diverge.Earthquakes are vibrations occurring in the lithospheric plates which move the surface of the earth.The vibrations spread all over the earth.The earthquake originates in the crust, and this point is called the focus.The point on the earth's surface perpendicularly above the focus is called the epicentre. The vibrations travel in waves, and their strength decreases as distance increases from the epicentre.The landscapes on Earth are continuously formed and worn away by two processes – weather and erosion.Weathering is a process by which rocks on the earth's surface are broken up.Erosion is the process by which there are layers of landscapes on the earth's surface.water, ice, wind, etc are the agents of erosion.Rivers are instrumental in erosion.When the running water of the river falls over the rugged rocks or a steep valley at a sharp angle, it forms a waterfall.On entering the plains, rivers twist and turn, and this is known as meanders. The river meanders come closer and closer due to erosion and deposition of silt.When a meander cuts off from the main river body, it is known as an oxbow lake.Sea waves on erosional and depositional activities give rise to coastal landforms.There are rocks present near the seas which are struck continuously by the sea waves.Cracks develop inside as a result of erosion and become enormous over time.There are hollow cave-like structures formed in the rocks, and these are known as the sea caves.Glaciers are frozen rivers of ice that erode landscapes by exposing solid rocks.They cut the ice in the deep well to melt it and fill it with water, forming a beautiful lake in the mountains.The deposits result in the formation of glacial moraines.The wind is an active agent of erosional and depositional activities in the deserts.There are mushroom rocks in the desert, which decline at the lower section more than the upper chamber. Hence, they have a narrow base and wider top.Blowing wind lifts and transports sand from one place to another in the desert. When the sand is deposited, it forms a low hill-like structure known as dunes.Very fine, light grains of sand, transported over long distances by winds, get deposited in more significant areas to form loess. China harbours large deposits of loess.1. Describe the formation of oxbow lakes. Ans: When rivers flow through the plain land, they bend into curves called meanders after descending from mountains. These meanders deposit silt on their banks, and hence the meander loops come closer and closer. Sometimes these loops cut off from the mainstream and form water bodies known as oxbow lakes. 2...
What are Lithospheric plates?How does vibration travel from the epicentre?Name a few common earthquake prediction methods.How is the landscape being continuously worn away?CBSE Class 7 Geography Chapter 3 – Our Changing Earth helps students understand about earth movements, how it is related to force, and how an earthquake happens, and explains terms like a volcano, focus, epicentre, etc. It further teaches concepts related to sea waves, rivers, ice and wind. All these concepts, as mentioned earlier, are ...
Oct 9, 2023 · Volcanoes – Our Changing Earth Class 7 Geography Chapter 3 – Credits : NCERT. Volcanoes: These are openings or vents in the Earth’s crust through which molten material (magma) erupts. Volcanoes are often found at plate boundaries where the Earth’s crust is weak. When magma erupts, it can form new landforms like mountains and volcanic ...
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Aug 1, 2023 · The four main layers of the Earth are the crust, mantle, outer core, and inner core. The Earth, like an onion, consists of several concentric layers, each with its own unique set of properties and characteristics. The four primary layers are the crust, the mantle, the outer core, and the inner core. However, geologists subdivide these layers ...
