Unit 4 Study Guide
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| Draggable item | arrow_right_alt | Corresponding Item |
|---|---|---|
Sediment | arrow_right_alt | bacteria from mammal waste |
Mercury or Heavy Metals | arrow_right_alt | can enter the water as part of acid mine drainage or as metals leach into water over time. |
Plastic | arrow_right_alt | Can enter the water as fertilizer, soaps, or detergents enter waterways. |
Nutrients | arrow_right_alt | a group of chemicals that don't easily break down that was manufactured to produce patins, plastics, and electrical equipment. |
PCBs | arrow_right_alt | washes into rivers due to runoff, makes the river more turbid or cloudy. |
Coliform Bacteria | arrow_right_alt | breaks down into smaller and smaller pieces, often accumulates in the ocean in the middle of major ocean gyres; can be harmful to marine wildlife. |
| Draggable item | arrow_right_alt | Corresponding Item |
|---|---|---|
Primary | arrow_right_alt | lets most remaining solids and oils settle after large items have already been removed from the wastewater. |
Secondary | arrow_right_alt | adds bacteria and oxygen to help remove any dissolved organic matter in the water; after this stage bacteria are killed usually with chlorine. |
Tertiary | arrow_right_alt | any additional treatment is done at this stage, like removal of nitrogen and phosphate nutrients. |
| Draggable item | arrow_right_alt | Corresponding Item |
|---|---|---|
Exxon Valdez Disaster | arrow_right_alt | occured when an oil tanker ran aground in Alaska in 1989, led to legislation that required oil tankers at sea to have an inner and outer hull |
Deepwater Horizon Disaster | arrow_right_alt | occured when an oil rig experienced a blowout that was unable to be capped for four months in the Gulf of Mexico |
| Draggable item | arrow_right_alt | Corresponding Item |
|---|---|---|
Jetty | arrow_right_alt | large piles of boulders or concrete built on either side of a coastal inlet to let a channel stay open for boats; built to prevent rivermouths or streams from meandering naturally; they completely disrupt and redirect the longshore current. |
Groin | arrow_right_alt | a shorline structure made of wood or boalders, concrete, or steel; designed to interrupt the longshore current eroding away the beach; causes more erosion on one side of the structure and less on the other side. |
Barrier Island | arrow_right_alt | islands along the coast of a continent that are long, narrow offshore desposts of sand or sediment that parallel the coastline. |
Sea walls | arrow_right_alt | a strcture meant to stop the nautral movement of sand by the waves that crash on the shore; temporarily hold back the ocean; built of concrete, wood, or steel and is a large wall that runs parallel to the beach. |
Beach Nourishment | arrow_right_alt | adding sand back to the beach as a replacement for all the sand that was lost due to erosion. |