Enviro

• for questions relating to drawing the layers of the earth, make sure the circles are to scale and should be in a pie diagram

  
• 2 reasons why population isn't evenly distributed across a country

  • lack of availability of jobs
  • lack of availability of infrastructure
  • lack of availability of resources
• 3 ways farmers can use water efficiently

  • trickle-drip system
  • reservoir
  • rainwater harvesting
  • bunds
• How do you randomly sample an area

  • choose certain coordinates on a map
  • use a random number generator
• 2 benefits of repeat sampling

  • can make comparisons between results
  • can identify anomalies
• How do biosphere reserves conserve biodiversity

  • acts as a protected area
  • prevents hunting
  • monitors the area
• define carrying capacity

  the maximum population or number of species that the ecosystem can sustain
• what will happen to a population if they hit carrying capacity

  • run out of food
  • water shortage
  • overcrowding
• how do you rehabilitate a mined area?

  • remove waste
  • fill with overburden
  • test for toxins
  • improve the soil through fertiliser aka bioremediation
  • planting of vegetation
• Why is reducing CO2 levels important?

  • it is a greenhouse gas
  • it contributes to global warming
  • it causes climate change
  • climate change has negative impacts like sea levels rising
• Describe strategies to reduce electricity consumption for a domestic sector

  • using more efficient appliances
  • turning off light when not in use
  • insulation
  • more windows for natural lighting
  • education/awareness
• Why is electricity consumption by the transport sector higher in MEDCs than LEDCs

  • MEDC can afford electric cars
  • MEDC has a larger electric public transport system
  • MEDC have more people travelling to work
• 2 processes that releases carbon dioxide in the carbon cycle

  respiration, combustion
• Why is conserving ecosystems important?

  • ensures availability for future generations
  • preserves biodiversity
  • prevents disruption of food webs
  • prevents loss of habitats