What is the major cause of sedimentation?
road building and home construction
mining and drilling
canals and irrigation
forestry and farming
Answers
Answer:
road building and home construction please mark me as brainlist
Answer:
mining
Explanation:
Decreased water clarity - increased sediment loading into a stream will decrease water clarity and reduce visibility for fish seeking food and places to live.
Damage to fish gills and filter feeding apparatus of invertebrates.
Changes to the benthic (bottom) structure of the stream/river bed - coarse substrates such as gravels and boulders are replaced/smothered by sand and silt.
Decreased numbers of invertebrate species from smothering of habitat - invertebrates are a food source to some mahinga kai (e.g., kōura and fish) and diverse invertebrate communities are also an indicator of healthy stream systems.
Decreased algal food supply at base of food chain – sediments can scour algae from rocks, make algae unpalatable, or reduce light to levels where algae cannot grow, because plants need light to photosynthesise.
Increased contaminants from surrounding land - sediments can transport attached pollutants such as nutrients, bacteria and toxic chemicals into our streams.