Geography Question Answers Chapter 4 Exogenetic Processes Part-2 Class 9 Maharashtra Board

Questions Answers For All Chapters – Geography Class 9th

Exercise

Q 1. Rewrite the correct statement:

(1) The temperature range helps the wind in its work.

• Correct: The temperature range helps the wind in its work by causing mechanical weathering, which creates loose particles for wind to carry.

(2) River’s work is more prominent than other agents of erosion in desert regions.

• Incorrect, rewrite: Wind’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.

• Correct: The work of groundwater is effective in areas with soft rocks because it can dissolve and erode them easily.

(4) The work of wind is not limited like river, glacier or the sea waves and takes place everywhere.

• Correct: The work of wind is not limited like rivers, glaciers, or sea waves and takes place everywhere, especially in open areas.

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.

• Incorrect, rewrite: The ice at the base of the glacier moves faster than the ice on the lateral side due to less friction.

(2) The depositional work by rivers happens because of gentle slope, reduced speed and transported sediments.

• Correct: The depositional work by rivers happens because of gentle slope, reduced speed, and transported sediments.

(3) A river flows at a faster speed than the glacier.

• Correct: 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.

• Incorrect, rewrite: The speed of the glacier is more in the middle than on both the banks due to less friction.

Q 3. Identify the wrong pair:

(1) Deposition – V-shaped valley

• Wrong: V-shaped valleys are formed by erosion, not deposition.

(2) Transport – Ripple Marks

• Correct: Ripple marks are linked to the transport and deposition of sand by wind or water.

(3) Erosion – Mushroom Rocks

• Correct: Mushroom rocks are formed by the erosional work of wind.
• Answer: The wrong pair is (1) Deposition – V-shaped valley.

Q 4. Identify and name the landforms in the following diagrams:

(Since diagrams are not provided, I’ll assume typical landforms from the chapter and suggest names based on context. Students should refer to their textbook diagrams.)

Possible Answer (Example):

• Diagram 1: V-shaped valley (erosion by river).
• Diagram 2: Sand dune (deposition by wind).
• Diagram 3: U-shaped valley (erosion by glacier).
• Diagram 4: Delta (deposition by river).

(Note: Check your textbook diagrams to match the exact landforms.)

Q 5. Complete the following table by classifying the landforms according to their agents of erosion:

Explanation:

• • Rivers: Waterfall (erosion), Delta (deposition), Pothole (erosion).
  • Wind: Barchans (deposition), Mushroom rock (erosion).
  • Glacier: Cirque (erosion), Arête (erosion), Moraine (deposition).
  • Sea Waves: Beach (deposition), Lagoons (deposition), Pillars (erosion).
  • Groundwater: Sinkholes (erosion), Stalactites (deposition), Stalagmites (deposition).

Q 6. Answer the following questions in brief:

(1) List the landforms that are a result of the erosional work of the rivers.

• Gorges (canyons).
• V-shaped valleys.
• Waterfalls.

(2) Which agent is responsible for formation of stalactites and stalagmites and where are they formed?

• Groundwater is responsible.
• They are formed in limestone caves.
• Stalactites hang from the ceiling, and stalagmites rise from the floor.

(3) List the landforms that are produced by the depositional work of the sea waves.

• Beaches.
• Sand bars.
• Lagoons.

(4) Name the types of moraines.

• Ground moraines.
• Lateral moraines.
• Medial moraines.
• Terminal moraines.