PEE - TOPIC 3

• Eco mean environment and system means interacting
• It is an ecosystem that operates by themselves without any major interference by man

  natural ecosystem
• Give me examples of terrestrial ecosystems

  deserts, grasslands, savanna, and forest
• Aquatic ecosystems could either be further distinguished as (a) fresh water & (b) marine or saltwater
• Artificial ecosystem is also called man-made or man-engineered ecosystems
• It is a miniature model of a natural ecosytem; also considered as artificial

  Micro ecosystem
• Dominated by organic materials

  organic layer
• Largely mineral soil developed from parent material

  topsoil
• Accumulation of mineral particles

  subsoil