Topics
Introduction to Chemistry
- Chemistry and Its Historical Perspective
- Importance of Chemistry
- Dark Side of Chemistry
Elements, Compounds and Mixtures
Elements, Compounds
- Matter (Substance)
- Natural substances
- Pure Substances
- Elements
- Types of Element: Metals
- Physical Properties of Metals
- Types of Element: Non-metal
- Physical Properties of Non-metal
- Type of Element: Metalloid
- Type of Elements: Noble Or Inert Gases
- Symbols Used to Represent Atoms of Different Elements
- Compound
- Atoms: Building Blocks of Matter
- Molecules
- Classification of Molecules
- Classification of Molecules
- Formula
Mixture
- Matter (Substance)
- Natural substances
- Pure Substances
- Impure Substance
- Compound
- Mixture
- Types of Mixtures
- Formation of Mixtures
- Separation of Mixtures
- Methods of Separation
- Filtration Method
- Decantation Method
- Handpicking Method
- Winnowing Method
- Sieving Method
- Magnetic Separation Method
- Sublimation Method
- Solvent Extraction (Using a Separating Funnel Method)
- Sedimentation Method
- Evaporation Method
- Crystallisation Method
- Simple Distillation Method
- Fractional Distillation Method
Matter
Matter
- Matter (Substance)
- Natural substances
- Composition of Matter
- Characteristics of Particles (Molecules) of Matter
- States of Matter
- The Solid State
- The Liquid State
- The Gaseous State
- Effects of Heat
- Heat and change of physical state
- Concept of Melting (Fusion)
- Concept of Boiling (Vaporization)
- Concept of Condensation (Liquefaction)
- Concept of Freezing (Solidification)
- Expansion of Substances (Thermal Expansion)
- Expansion of Solids
- Expansion of Liquids
- Expansion of Gases
- Classification of Change: Reversible and Irreversible Changes
Common Laboratory Apparatus and Equipments
- Importance of 'observation' and 'experiment' in chemistry
- Chemistry Laboratory
- Precautions to Be Taken in a Chemistry Laboratory
Water
- Water: Our Lifeline
- Sources of Water
- Change in State of Water
- Water Cycle
- Importance of Water
- Anomalous Expansion of Water
- Potable Water
- Waterborne Diseases Caused by Bacteria
- Waterborne Diseases Caused by Virus
- Purification of Water
- Tap Water Contains Dissolved Impurities
- Simple Distillation Method
- Components of Solutions
- Water - a Universal Solvent
- Physical Properties of Water
- Water Management (Conservation of Water)
- Fresh Water Management
- Water Pollution and Its Causes
- Effects of Water Pollution
- Prevention of Water Pollution
- Drought (Famine)
Air and Atmosphere
- Air Around Us
- Atmosphere and Its Layers
- Air is a Mixture
- Importance of Oxygen
- Importance of Nitrogen
- Importance of Carbon Dioxide
- Composition and Components of Air
- Importance of Air
- Photosynthesis: Food-Making Process in Plants
- Process of Photosynthesis
- Rusting
- Air Pollution and Its Causes
- Effects of Air Pollution
- Prevention of Air Pollution
- Introduction
- Causes of Famine
- Prevention of Famine
Introduction:
A famine occurs due to a prolonged shortage of food and water, impacting crops, food supplies, and overall survival. It leads to severe hardship for people, animals, and plants.
It occurs due to:
- Lack of Rain: When it doesn't rain for a long time, water in rivers, lakes, wells, and dams starts to dry up. The land also becomes very dry because water evaporates.
- No Water for Agriculture: Without enough water, crops cannot grow. This leads to a shortage of food for people and animals. The land becomes too dry to plant anything.
- Effects of a Famine: People and animals suffer because there is not enough water or food. Grain and fodder (food for animals) become scarce, which means there isn’t enough for everyone. You may have heard of famines happening in different parts of the world, including our country or state.
- Government Help: During a famine, the government helps by moving people and animals to safe places where they can get food, water, and shelter. Fodder camps are set up to feed animals and take care of them during the famine.
Causes of Famine:
1. Natural Causes
- Drought (main cause)
- Floods and heavy rains
- Storms, cold waves, or fog
- Pest attacks (like locusts) or crop diseases
- Crops destroyed by animals (mice or rats)
- Earthquakes and other natural disasters
2. Human Causes
- War and internal conflict
- Lack of transport routes
- Misuse of water and soil erosion
- Unbalanced rainfall and population growth
- Overuse of water and deforestation
- Chemical fertilizers and pesticides
Prevention of Famine:
- Conserve and Reuse Water
- Water Harvesting and Storage
- Plant More Trees
- Prevent Deforestation
- Weather-Based Planning
Historical examples,
- Chhatrapati Shivaji Maharaj and Chhatrapati Shahu Maharaj made water storage schemes to fight famines.
- Malik Ambar built a canal system in Aurangabad, which still provides water today.
- Severe famines have affected India, China, and Asia the most, especially in regions with droughts and floods.
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