The Class 9 is an important year in a student’s life and Maharashtra State Board Social Science Geography is one of the subjects that require dedication, hard work, and practice. It’s a subject where you can score well if you are well-versed with the concepts, remember the important formulas and solving methods, and have done an ample amount of practice. Worry not! Home Revise is here to make your Class 9 journey even easier. It’s essential for students to have the right study material and notes to prepare for their board examinations, and through Home Revise, you can cover all the fundamental topics in the subject and the complete Maharashtra State Board Class 9 Social Science Geography Book syllabus.
Q 1. Rewrite the correct statement:
(1) The temperature range helps the wind in its work.
(2) River’s work is more prominent than other agents of erosion in desert regions.
(3) The work of groundwater is effective in the area with soft rocks.
(4) The work of wind is not limited like rivers, glaciers or the sea waves and takes place everywhere.
Answer 1: Yes, the temperature of the Earth ’s surface helps the wind. Winds blow from high pressure to the low pressure areas, so the temperature is an important factor for wind flow.
Answer 2: No, wind erosion is more important than the other agents in desert areas. Since sparse vegetation and loose soil is present in the desert, hence, the wind easily carries and deposits the sediments.
Answer 3: The groundwater work is powerful in the area with hard rocks. Due to weathering in the hard rock, fractures are created and water seeps through the rock and gets deposited.
Answer 4: Yes, the wind is blown everywhere. So, its work is not only limited in the desert areas alone.
Q 2. Correct and rewrite the incorrect statements:
(1) The ice on the lateral side of the glacier moves faster than the ice at the base.
(2) The depositional work by rivers happens because of a gentle slope, reduced speed and transported sediments.
(3) A river flows at a faster speed than the glacier.
(4) The speed of the glacier is more on both the banks than in the middle.
Answer 1: The statement given here is wrong. It is because the ice which is usually present at the base of the glacier cannot move faster than the ice on the lateral side of the glacier.
Answer 2: The statement given here is wrong. The correct statement is “The depositional work by rivers happens because of a gentle slope, reduced speed, and cannot transport sediments”.
Answer 3: The statement is correct.
Answer 4: The statement is wrong. The correct statement is “The speed of the glacier is much more in the middle than on both banks of the glacier”.
Q 3. Identify the wrong pair
(1) Deposition –V-shaped valley
(2) Transport –Ripple Marks
(3) Erosion –Mushroom Rocks
Answer: The wrong pair is Erosion –Mushroom Rocks. V-Shaped Valleys are produced due to erosional work of rivers.
Q 4. Identify and name the landforms in the following diagrams:
Answer: Figure 1 is the V-Shaped Valley.
Figure 2 is Stalactite and Stalagmite.
Figure 3 is called Moraines.
Q 5. Complete the following table by classifying the landforms according to their agents of erosion.
(waterfall, delta, cirque, arête, barchans, moraine, pothole, mushroom rock, sinkholes, beach, pillars, lagoons)
| Rivers | Wind | Glacier | Sea Waves | Groundwater |
Answer:
| Rivers | Wind | Glacier | Sea Waves | Groundwater |
| Waterfall, Delta | Barchans, Mushroom Rock | Cirque, Arête, Moraine | Beach, Lagoons | Pothole, Sinkholes, Pillars |
Q 6. Answer the following questions in brief.
(1) List the landforms that are a result of the erosional work of the rivers.
(2) Which agent is responsible for the formation of stalactites and stalagmites and where are they formed?
(3) List the landforms that are produced by the depositional work of the sea waves.
(4) Name the types of moraines.
Answer 1: List of landforms that are a result of the erosion work of rivers are:
1. Valleys: Valleys are formed when the river flows between two mountainous ranges causing fluvial erosion. Depending on the degree of erosion, the steepness of the valley varies. However, both the valley sides meet on the floor. Gorges and canyons are the two types of valleys usually formed.
2. Waterfalls: Waterfalls occur due to sudden descent or break in the water flow. This may be due to steepness of the rocks, sudden earth movements, etc. The height of the waterfall depends on the difference in the topographic levels of the plains or the rocks thus moved.
3. Potholes: Potholes are kettle-like small depressions formed in the rocky terrain and are cylindrical in shape.
4. Water Terraces: Due to the sudden change or lowering of river floors, flat narrow surfaces on either side of the river bed are created called river terraces.
Answer 2: There are various agents which are mainly responsible for the formation of a stalagmite as well as a stalactite. On the cave floor or in a pile, usually, more calcite is left by the water from the end of the stalactite. And this usually results in the formation of stalagmite. So, stalagmite is very similar to a cone shape. But sometimes a column or pillar is formed by them. The main characteristics of these two things are that they usually are found in pairs.
Answer 3: The landforms like beaches, sand bar, lagoons are formed due to the depositional work of the sea waves.
Beach –Large amounts of sediments coming from the landward side in areas between two adjoining headlands. Such sandy deposits along the coasts are called beaches.
Sand bars –Sand gets deposited along the sides of headlands. The deposited sand comes into the sea at some distance away from the beach. This is called sand bars.
Lagoons –The brackish water separated from the seawater by sand bars and lying in the areas between the coast and bars is called lagoons.
Answer 4: Different types of moraine are: