CBSE Class 6 Social Science Landforms and Life Assignments Set 03

True or False

Question. Sediments from rivers deposited in the plains make the ground fertile.
Answer: True
Explanation: Rivers wash down fresh soil packed with plant food, turning plains into great farmland.

Question. Mountains are landforms that are shorter than the surrounding landscape.
Answer: False
Explanation: Mountains tower high above the land around them!

Question. The Himalayas are still increasing in elevation.
Answer: True
Explanation: The giant plates under Earth are still pushing into each other, making the Himalayas grow a tiny bit every year.

Question. The meeting point of two or more rivers is called junction.
Answer: True
Explanation: When two rivers meet and join together into one big river, it is called a confluence or junction.

Question. The Himalayas are still expanding in height.
Answer: True
Explanation: Giant rocks deep under the ground keep pushing together, making the Himalayas grow a tiny bit taller each year!

Question. Mountains are landforms that are shorter than the surrounding landscape.
Answer: False
Explanation: Mountains are very tall and rise high above the land around them.

Questions / Short Question Answers

Question. What is terracing used for?
Answer: Terracing is used to build flat planting areas on slopes and reduce soil erosion.
Explanation: Cutting flat steps into steep hills stops rain from washing the farm plants away.

Question. What is a river mouth?
Answer: A river mouth is the destination where a river enters a sea, ocean, or lake.
Explanation: The mouth is the finish line where a river ends its journey and hugs the ocean.

Question. Why do mountains have varied microclimates?
Answer: Due to changes in altitude, slope, and exposure, mountains have varied temperatures and rainfall over short distances.
Explanation: One side of a mountain can be sunny and warm, while the top is freezing cold and snowy!

Question. How do mountains help river formation, and how does it impact the fertility of floodplains?
Answer: Melting snow and glaciers flow down mountains to create continuous rivers. As rivers flow, they deposit rich sediment onto floodplains, making them super fertile for crops.
Explanation: Mountains turn snow into rivers, and those rivers carry mineral mud down to make farmland extra healthy.

Question. Write brief notes on Plains.
Answer: Plains are broad stretches of flat or gently rolling land. Because rivers bring fertile soil and water, the world's first great civilisations began on plains.
Explanation: Plains are giant, flat fields where it is easy to build roads, grow food, and build cities.

Question. Define plateau and give its significance.
Answer: A plateau is a landform that rises steeply above surrounding land and has a flat surface. Significance: Plateaus are packed with valuable minerals and host major mining activities.
Explanation: A plateau is an elevated tableland that holds buried treasures like metals and minerals.

Question. Into how many categories are landforms divided?
Answer: Landforms are classified into three main categories: 1. Mountains, 2. Plateaus, 3. Plains.
Explanation: Geographers divide our Earth's natural shapes into these three basic families.

Question. Why did early civilisations often settle near rivers in plains?
Answer: They settled in river plains because the land was flat for building, the soil was fertile for growing crops, and rivers provided fresh water for drinking.
Explanation: Ancient humans needed drinking water, fish, and rich soil to grow grain, so riverbanks were the best place to live.

Question. Increased irrigation poses challenges for agriculture in the Gangetic plains. How?
Answer: Pumping too much water for farm crops helps today's harvest, but it is dangerously emptying out underground water wells for tomorrow.
Explanation: If we pull too much water out of the ground with motor pumps, our deep wells might run dry!

Question. What are the main types of landforms, and how do they vary from each other?
Answer: Mountains are tall and steep with peaks; plateaus are elevated flatlands with steep edges that hold minerals; plains are low, flat lands formed by rivers that are great for farming.
Explanation: Mountains are like pointy towers, plateaus are like raised tables, and plains are like flat floors.

Question. What is the role of coastal mangroves?
Answer: Mangroves protect coastlines from erosion, provide fish nurseries, and trap sediments and pollutants.
Explanation: Mangrove trees have tangled roots that keep shoreline dirt safe and give baby fish a safe home.

Question. What is desertification?
Answer: Desertification is the transformation where fertile land becomes desert due to overuse, drought, or poor land management.
Explanation: It is when healthy green land dries up and turns into a sandy desert because of too little care or rain.

Question. What is the impact of monsoon on plains?
Answer: Monsoon rains provide essential water for agriculture but can also cause floods in plains.
Explanation: Monsoon rains bring farmers the water they need, but too much rain can cause flooding.

Question. What is a coastal lagoon?
Answer: A lagoon is a shallow body of water separated from the sea by sandbars, coral reefs, or barrier islands.
Explanation: A lagoon is a calm, shallow salt lake separated from big ocean waves by sand or coral.

Question. How do human actions cause soil erosion?
Answer: Deforestation, overgrazing, improper farming, and construction remove vegetation and expose soil to erosion by wind and water.
Explanation: When people cut down too many trees, there are no plant roots left to hold the soil tight.

Question. What is a hill?
Answer: A hill is a natural elevation of land lower than a mountain, usually with rounded tops.
Explanation: A hill is like a baby mountain—much smaller, rounded, and easier to hike!

Question. Define land surface slope.
Answer: Slope is the incline or steepness of the land surface, important for drainage and farming methods.
Explanation: Slope means how slanted the ground is, just like a playground slide!

Question. How do islands collect freshwater?
Answer: Islands get freshwater from rainfall, groundwater aquifers, or sometimes by rainwater harvesting and desalination.
Explanation: Islands catch falling rain and collect underground water since sea water is too salty to drink.

Question. What is a river natural levee?
Answer: A natural levee is an elevated bank built by river sediments deposited during floods along the river channel.
Explanation: A levee is a natural raised ridge made of mud along a riverbank that helps stop floods.

Question. Why are plateaus utilized for mining?
Answer: Plateaus expose older rock layers that often contain valuable minerals, making extraction easier.
Explanation: Plateaus have rocky layers close to the surface packed with iron, copper, and gold.

Question. What is an alluvial plain?
Answer: An alluvial plain is a flat region formed by repeated deposition of river-borne silt and sediments.
Explanation: It's a flat valley covered in soft, healthy mud left behind by river floods over centuries.

Question. How does city urbanization affect landforms?
Answer: Urbanization changes natural landforms by paving soils, altering drainage, and increasing erosion and flood risk unless managed.
Explanation: Paving roads with tar and concrete stops rainwater from soaking into the earth.

Question. What is the value of the Western Ghats for India?
Answer: The Western Ghats are a biodiversity hotspot, influence monsoon rainfall, and supply rivers important for agriculture.
Explanation: These mountains catch rain clouds, water many rivers, and provide a home for wonderful animals.

Question. What is a sand dune belt?
Answer: A dune belt is a continuous strip of sand dunes shaped by wind along deserts or coasts.
Explanation: It is a long line of wavy sand hills built and pushed along by blowing winds.

Question. Why are tablelands often mineral-rich?
Answer: Plateaus expose older rocks and geological layers that often contain concentrated mineral deposits.
Explanation: Old rocks inside plateaus are filled with cool treasures like coal, iron, and gems.

Question. What is subsidence?
Answer: Subsidence is the sinking or settling of the earth's surface, sometimes caused by natural or human activities like groundwater extraction.
Explanation: Subsidence happens when the ground slowly sinks down like a deflating balloon.

Question. What is a flood prevention measure?
Answer: Flood control measures include building embankments, dams, reservoirs, and improving drainage and early warning systems.
Explanation: Building walls and dams along rivers keeps overflow water from rushing into towns.

Question. Why do valleys regularly have rivers?
Answer: Valleys are often carved by flowing water, so rivers commonly run through them.
Explanation: Water always flows downhill to the lowest spot, carving out the valley as it journeys.

Question. How do hills influence culture?
Answer: Mountains shape local clothing, housing, festivals, occupations (like herding and tourism), and spiritual beliefs.
Explanation: People in cold mountains wear thick woolly clothes and build warm wooden houses.