Telangana SCERT Class 9 Social Studies Chapter 2 Solution – The Natural Realms of the Earth -Lithosphere. Here in this post we provides Class 9 Social Studies The Natural Realms of the Earth -Lithosphere Telangana State Board Solution. Telangana State Board English Class IX Medium Students can download this Solution to Solve out Improve Your Learning Questions and Answers.
Telanagana State Board Class 9 Social Studies Chapter 2 The Natural Realms of the Earth -Lithosphere Solution:
1.) Find the odd one out in the context of lithosphere and give reasons for your choice
Byson gorge; Grand canyon; Ozone; Thar desert.
Answer: Ozone is odd one out because the Grand Canyon, the Byson Gorge and the Thar Desert are located on the earth or part of the lithosphere and they are land forms. Ozone is a gas, so it is present in the atmosphere. thus, it is Ozone is the odd one out in the context of the lithosphere.
2.) How is the lithosphere formed?
Answer: It is the solid crust like the hard top of the Earth. It consists of rocks and minerals and is covered with a thick layer of soil. In Greek, ‘Litho’ means stone or rock and ‘sphaira’ means sphere or ball. It is not a smooth surface as we see it on Earth, but has high mountains, plateaus or highlands, low plains, deep valleys and very deep basins filled with water (oceans). Many of these characteristics are shaped by wind and water. Parts of this crust, in the form of dust, etc., are also mixed with air. When the lithosphere warms up by the sun’s rays or cools down, it also affects the air and water. We and most other living things live in this realm. We use rocks and soil and other things found on this hard crust in a number of ways.
3.) How are the continental plates formed and how are they eventually destroyed?
Answer: There are about seven large plates on Earth and several smaller ones. The main plates are African, North American, South American, Indo-Australian, Antarctic, Eurasian and Pacific plates. Among the small plates are the Nazca and Arabian plates. These plaques actually “float” on the mantle. They are constantly trained and therefore persist slowly. They move so slowly that we cannot feel the movement. As a result of this movement, a plate pushes another neighbouring plate. The region where the two plates meet and push each other, strong pressure is exerted by each of them on the other. One plate is pressed under the mantle, while the other plate is pushed upward to form a mountain range. This movement of the plates is called “plate tectonics”. This process causes earthquakes etc.
The margins of the plates as well as the limits where the plates meet are the places of the highest geological activity. In the margins of plates where one plate meets another, the incoming plate often dips under the stable plate. In fact, the incoming plate enters the earth’s mantle and is melted by the heat of the mantle. The plaque that goes into the mantle actually pulls the rest of the plaque. Continental plate destroyed as well.
4.) List out the landforms formed due to the river work.
Answer: Here are the landforms formed due to the river work
i) V-shaped valley – V-shaped valleys are located upper side of the river as a result of the same erosion and stormy weather. They are located upper side because the river has the highest energy potential of gravity.
2) Waterfalls – Waterfalls occur when the lithology (type of rock) along the river has changed, causing a variety of erosion. When the rock type of a river’s channel changes from a resilient rock to a less resilient one such as granite limestone, the river accelerates a less resilient rock, causing a sharp steep collapse. Resistant rock is higher than less resilient. As the river flows into the resistant rock, it falls into the less resistant rock, wiping it out and creating a larger gap between the two rock types, creating a waterfall.
3) Meanders – Curved turns are a bend in a river that occurs as rivers. River’s sinuosity is a measure of the difference between a river and a straight line.
4) Oxbow Lakes – It’s an evolution of meanders; these lakes go through broad deposition and erosion.
5) Floodplains – Floods are large flat lands that form on either sides of a river. A river plateau is a place where a river flows into a large stream.
6) Delta – Deltas are a type of land deposited at the mouth of a river where rivers meet more slowly than rivers.
5.) Draw a table as given below and fill information. And write a small paragraph to explain the similarities and differences that you can think of in the context of earth’s external changes. (if there is no information available in the text, leave the columns blank)
Answer:
Wind | Water | Glacier | |
Landform | Sand dunes | Waterfall
|
U-shaped valley. |
Process | Erosion | Erosion | Plucking |
6.) Why are Glaciers not found in your surroundings?
Answer: In very cold regions like the Himalayas or the Alps, it snows heavily – snow falls instead of precipitation. This snow accumulates and hardens into ice. As it builds up, it slowly sinks downward until it reaches the hot area where the ice melts and a small river begins. This is how the Ganga river is formed from the Gangotri glacier in the Himalayas. In our region the climate doesn’t allow snowfall this is the reason that the snow cannot accumulate and harden into ice and turn into a glacier.
7.) How are beaches formed and name some Beaches?
Answer: The beach is formed when the waves deposit sand and gravel along the shore and pebbles. Over the time, carry them properly. Rocks generally reflect local geology. Some of the beaches are Goa, Palolem beach, Dumas Beach, Sunset at Panambur Beach, Malpe Beach, Puri Sea Beach at Sunrise.
8.) How is the human lifestyle responsible for extension of deserts?
Answer: Human life is responsible for expanding desserts in the following ways. The cutting of trees for human allocation has led to deforestation; on the other hand, deforestation has led to the collapse of trees in water areas and sources of rain.
9.) Find out the order of the landforms for the following:
Answer:
Sr. No. | Landform | Order of Landform |
1 | The Himalayan Mountains | IInd Order Landform |
2 | The Pacific Ocean | Ist Order Landform |
3 | Asia Continent | Ist Order Landform |
4 | Byson Gorge | IIIrd Order Landform |
5 | Jog waterfall | IIIrd Order Landform |
6 | Rocky mountains | IInd Order Landform |
7 | The Indian Ocean | Ist Order Landform |
8 | The Great rift valley | IIIrd Order Landform |
11.) Read the para under the title ‘Erosion’ on page 20 and comment on it.
Answer: Running water and wind are powerful and can slowly wear down or cut rocks and soil in higher places. Water works in many ways such as rain, river, running groundwater, sea waves, glaciers, etc. The wind can be in many ways, like storms, gusts, constant winds etc. The active wear and tear of these moving factors is called erosion.