Natural Environment 

  • Natural environment: includes biotic (living) and abiotic (non-living) components

  • Biotic components: plants and animals

  • Abiotic components: air, water and soil

Four Major Domains of the Earth are 

  • Lithosphere

    •  rocky outermost layer of the earth
    • Includes crust and upper part of mantle
    • Average thickness: 100 km
    • Made of rocks, minerals and soil
    • Forms landforms on continents and ocean basins
    • Provides land for building, agriculture and resources
  • Hydrosphere

    • water present on the earth’s surface
    • Includes oceans, seas, bays, lakes, rivers, etc.
    • Also includes groundwater below the surface
    • Supports all forms of life
    • Water found in three states: solid, liquid and gas
    • Freshwater available through water cycle
  • Atmosphere

    •  envelope of air surrounding the earth
    • Held by gravity
    • Contains oxygen, carbon dioxide and other gases
    • Prevents harmful rays from reaching the earth
    • Controls temperature and weather
    • Without atmosphere, earth would be barren
  • Biosphere

    • narrow zone where lithosphere, hydrosphere and atmosphere meet and interact
    • Supports life and is called the living world
    • Consists of plant and animal kingdom
    • Small in size but has many species of organisms
    • Provides nutrients and resources to living beings
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Davneet Singh's photo - Co-founder, Teachoo

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Davneet Singh

Davneet Singh has done his B.Tech from Indian Institute of Technology, Kanpur. He has been teaching from the past 14 years. He provides courses for Maths, Science, Social Science, Physics, Chemistry, Computer Science at Teachoo.