yt link test

• Earth is the only planet known to cater life forms
• Earth's environment had allowed single simple microorganisms to evolve into more complex and diverse beings
• Earth is said to be in the sun's goldilocks zone and is also known as goldilocks planet
• Characteristics of Earth that enable life to flourish

  • Temperature
  • Water
  • Atmosphere
  • Energy
  • Nutrients
• Temperature


  Influences how quickly atoms, molecules or organisms move. Low temperatures slow down chemical reactions and produce ice that makes liquid water unavailable. High temperatures can cause breakdown of important biological molecules.
• If the Earth is too close to the sun


  It will be very hot, the liquid water will boil and evaporate into gas
• If the Earth is too far from the sun


  It will be very cold, everything will freeze and no life on Earth would exist
• Sun


  Provides the ultimate source of energy needed to support life. Its light energy gives energy to plants for photosynthesis and warms the planet to drive the hydrologic cycle.
• Water


  Necessary for life to exist. It helps regulate body temperature, carries nutrients to cells, and is used by plants in photosynthesis.
• Atmosphere


  Protects from small meteors, blocks harmful rays, provides insulation and greenhouse gases, and supplies chemicals needed for life.
• Nutrients


  Essential for building and maintaining organisms' body structure. Nutrient cycling processes like water, carbon, oxygen, phosphate, and nitrogen cycles help recycle nutrients.
• Volcanism


  Helps in cycling nutrients
• Low temperature slows down chemical reactions among living organisms
• Atmosphere provides chemicals needed for life
• Gravity affects the Earth's atmosphere
• Greenhouse gases trap heat from the sun
• Size and distance from the sun affect the planet's ability to hold atmosphere
• Absence of water interferes with reactions necessary for life
• Most living organisms need sunlight as a major source of their energy
• Insufficient or absence of nutrients can hinder different biological processes
• Volcanism helps in nutrient recycling
• Atmosphere protects Earth from small to medium-sized meteorite impacts
• The most important factor that determines Earth's temperature is its distance from the sun
• Atmosphere does not provide energy, but provides significant insulation, protects from harmful radiation, and gives protection against small to medium-sized meteorites
• A greenhouse gas is a gas that traps heat
• An Earth-like planet that is at the same distance from its star as Earth, has a thick atmosphere of carbon dioxide, and shows no volcanic activity, can be inferred to be hot and have no nutrient cycling
• The ozone layer protects life on Earth by protecting it from the sun's harmful radiation
• If greenhouse gases increase in Earth's atmosphere, the Earth's temperature will increase
• If the ozone layer totally depletes, it will lead to penetration of ultraviolet radiation to Earth's surface
• The ozone layer's functions do not include producing enough rain, regulating weather, or protecting Earth from meteors and asteroids
• Temperature, water, and nutrients are all essential factors for life to exist
• Temperature affects biological and chemical processes