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- 1. Multiple ChoiceHow much of Earth's water is unavailable for humans to consume due to its high salinity?3%23%77%97%
- 2. Multiple ChoiceWhy must humans clean water before using it?Humans are unable to digest untreated river waterRiver water is free of any contaminant or pollutantsUntreated river water is brown and humans prefer clear waterClear water may contain contaminants that could harm humans
- 3. Multiple ChoiceHow does the amount of water circulating in the water cycle change?The amount of water remains constantThe amount of water increases each time it rainshe amount of water decreases and then increases each dayThe amount of water decreases every time evaporation occurs
- 4. Multiple Choice
How is freshwater treatment different from wastewater treatment?
Freshwater contains oils and vitamins needed for health
wastewater is not treated after use to protect the environment
Wastewater removes pollution to make potable water
Wastewater is treated after use to protect the environment
- 5. Multiple Choice
Which statement best describes how estuaries are positive environment for animals and plants
They flood regularly destroying organisms' habitat
They provide a safe hatchery full of nutrients and food
They dry up each summer stranding organisms in shallow water
hold high numbers of predators to feed off young organisms
- 6. Multiple ChoiceHow is the intertidal zone different from the open ocean environment?Conditions in the intertidal zone remain constantThe intertidal zone's conditions constantly changeThe open ocean is the shallowest zone in the oceanthe conditions in the open ocean change continually
- 7. Multiple ChoiceWhy is nitrogen gas important to the health of the ocean and its organisms?It is needed to make amino acids, proteins, and DNAIt is the main gas needed for photosynthesisis needed to produce energy during cellular respirationHard-shelled organism need it to make their shells.
- 8. Multiple ChoiceHow does mining on the ocean floor negatively affect the surrounding ecosystems?High turbidity clog the gills of ocean organismsHeavy metals in the food chain causing fish to weigh more.Increase in suspended solids cover fish make them invisibleSuspended solids in water blind organisms
- 9. Multiple ChoiceHow does warmer temperature affect plants living in the ecosystem?holds less solids, allowing pants to grow year roundHolds less gases, making plants to use gas stores in cellsHolds more oxygen, letting plants conduct photosynthesisHolds more solids, blocks sunlight, and stops photosynthesis
- 10. Multiple ChoiceHow can a change in the pH of water affect the ecosystemHigher pH levels suffocates fish and causes them to dieLower pH levels creates a healthier environment for fishChange in pH affect which biological &chemical process occurpH levels changes the temperature of water
- 11. Multiple ChoiceHow does turbidity describe a water system's health?High turbidity contains less suspended solids and healthierTurbid water contains more dissolved gases than solids.Less turbid water contains less suspended solids than gasesLow turbidity contains more gases and solids in water
- 12. Multiple ChoiceWhich statement best describes why an algae bloom forms?Decreased amounts of fish eating on the algaeDecreas of pollution allow algae absorb gases and grow fastHigh amount of light stimulate photosynthesis to occurHigh amounts of fertilizer from farms/ fast growth of algae
- 13. Multiple ChoiceWhich organism would be considered the best bio-indicator?Hawk that eats fish from the lakeLake fish that can live in a wide range of pH levelsCrab lives in warm, shallow lake waters and sleeps in winterBacteria in lake that can tolerate only small changes in pH
- 14. Multiple ChoiceWhy is such a small amount of freshwater available for humans to readily use?Majority of freshwater is mixed in with the ocean waterMost of fresh water is frozen in glaciers and polar ice capsMost of freshwater found in the gas form in the atmosphereMost of freshwater is liquid in lakes, rivers , & aquifers
- 15. Multiple ChoiceAll the water on, in , and surrounding the earthAtmosphereHydrosphereBiosphereLithosphere
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