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Terms in this set (79)
Why is freshwater in short supply on Earth?
most of it is frozen
Which is the most abundant freshwater resource in North Carolina?
Where is the majority of Earth's freshwater found?
polar ice caps
Of the 74% of Earth's surface that is covered in water, which contains the most water?
Which statement best compares the amount of water present on Earth today with the amount present millions of years ago?
There is about the same amount of water on Earth today.
Where is most of Earth's available freshwater stored?
Approximately what percentage of the hydrosphere is represented by the oceans on Earth?
Which best explains why so little of the water on Earth is available for human use?
97% of total water on Earth is salt water, and most of the remaining 3% is freshwater frozen in ice caps and glaciers.
Which will most likely happen if a higher percentage of water is located in the ground than in the oceans?
Water will take more time to complete the water cycle.
Which best explains how estuaries support plant and animal life?
The habitat areas provide nutrients and shelter.
Which best describes a significant benefit estuaries have on the environment?
Coastal Wetlands provide safe and ideal conditions to support animal habitats
Which ocean zone contains hydrothermal vents?
What is the movement of cold, nutrient-rich waters from the bottom of the ocean, promoting algae growth?
In which ocean zone is ocean temperature most affected by the weather?
How do oceanic upwellings promote the growth of microscopic plankton?
They bring dissolved nutrients to the surface of the ocean.
How does upwelling generally affect the dissolving of gases in ocean water?
Cooler water increases the amount of gas dissolved
How is sonar used to map the surface of the ocean floor?
Sound waves are emitted and bounce off the ocean floor to determine the distance from the receiver
Which best explains how the levels of nutrients, minerals, and dissolved gases in an estuary compare to those in surrounding bodies of water?
The levels vary depending on the river and the ocean that connect to it
Which best explains why there is a greater concentration of oxygen located near the oceans surface.
Plants, which release oxygen, live near the surface of the ocean, where they receive large amounts of sunlight.
Which evidence best supports that there are a variety of nutrients in Earths oceans?
A wide range of organisms is sustained in Earths oceans.
To which condition do all species in the ocean depths have to adapt?
Organisms that live in an interidal zone must be able to tolerate which changes to survive?
changes in both temperature and salinity
In which location would fishermen most likely catch a greater number of fish?
in an upwhelling
Which is the main source of dissolved oxygen in the ocean
plants and algae that live near the surface
Which best describes the shallow water ocean zone
Sunlight penetration increases algae growth and provides food for a variety of organisms
Which is able to give the most detailed information about the topography of a large area on the ocean floor?
What causes upwhelling in the oceans
winds and ocean currents
How is the amount of oxygen in the ocean water affected by temperature
The amount of oxygen in ocean water increases as temperature decreases.
Which factors limit the productivity of marine ecosystem?availability of light and nutrients
availability of light and nutrients
Which would most likely be discovered by researchers exploring the deep ocean with remotely operated vehicles new chemosynthetic species?
new chemosythetic species
Deep ocean technology has discovered organisms in hydrothermal vents that do not rely on sunlight to survive. What do these organisms use as their energy source?
Which provides the largest source of dissolved oxygen in the ocean
Which causes cold ocean water to rise during an upwhelling event?
deep water currents
Which are the most abundant dissolved gases in the ocean water?
oxygen and carbon dioxide
Which is most effective technology in monitoring large areas o of the ocean floor?
Which best describes the source of oxygen in the ocean water?
Oxygen is produced by marine plants in the process of making food
Which has deep sea technology helped enhance understanding of the most?
Which contributes must in supporting life on the deep ocean floor?
Which technology is most efficient in mapping late areas of the ocean floor
Which best explains why the diversity and productivity of marine ecosystems is important to the survival of terrestrial (land) organisms?
Marine habitats support species that serve as animal food and fertilizers for crops
Which best describes the water distribution in an estuary?
The freshwater is close to the surface that the saltwater.
Why is productivity greatest near the oceans surface?
Sunlight penetrates the top layers of the ocean
What area of the ocean is most benefited by upwhelling?
the surface of the ocean
What best explains the poor productivity of the open oceans?
Photosynthis is reduced because sunlight does not penetrate very deeply.
Which best describes the relationship between salinity levels and the amount of dissolved gases in ocean water?
As salinity increases, the amount of dissolved gases decreases
What most directly affects the amount of dissolved oxygen in a body of water?
The overall health of a body of water can be most accurately determined by studying which property of the water?
amount of dissolved oxygen in the water
Which most likely has the highest number of contaminants in the water?
a water system with high turbidity
Which groundwater contaminant contained in fertilizers and pesticides comes from farms?
Which is the most likely effect of too much nitrogen and phosphorus flowing into a lake?
Why do biologists use indicator species?
to monitor water quality and biodiversity
Which is a bioindicator?
Which would most likely cause a sudden increase of nitrates in a waterway?
runoff from a golf course
What effect does an algal bloom have on in a lake?
Algal blooms would lower dissolved oxygen levels, causing fish to suffocate.
Which water quality indicator can be determined by measuring how light travels through water?
Which best explains why a scientist would use nets to capture and count organisms in a river?
to measure biodiversity
A company has acquired land next to a local river. One month after the company opened, the pH of the river dropped from 6.7 to 6.2, and the month after that, the pH was 5.9. Which effect would lowering the pH most likely have on the organisms in the river basin?
Some organisms would adapt to the new pH, while others that could not, would die.
Which would a scientist expect to find in a lake that experienced a sudden increase in nitrate levels?
an increased amount of algae and aquatic plants
A high concentration of phosphates and nitrates is found in water samples from a pond. Which is most likely the source?
runoff from agricultural fields
Why is it important to monitor turbidity levels of a water system?
Suspended particles diffuse sunlight and absorb too much heat.
Which will occur if humans continue to overload water systems with excess nutrients?
Which aspect of fertilizer pollution would have the greatest negative impact on an aquatic ecosystem?
Algal blooms deplete the oxygen and block the sunlight from penetrating a body of water.
A recreational lake experiences eutrophication because of excess nutrients. Based on this information, how would the recreational lake most likelyappear?
murky and full of algae
Which chemical elements in fertilizers pollute stormwater runoff and contribute to excessive plant growth in a water system?
phosphorous and nitrogen
In which way does a flood have the greatest impact on local water quality?
It allows many foreign materials to enter the water.
Which best describes the relationship between temperature and dissolved oxygen in a lake?
As temperature increases, dissolved oxygen decreases.
Which process would most likelyincrease the dissolved oxygen level in a freshwater lake?
Which substance will most likelycause a decrease in pH if it is leaked into a North Carolina waterway by a local industry?
Which best explains the importance of pH in determining the health of a water system?
Variations in the pH of water can indicate the presence of toxic substances.
How are indicator species like a warning system for bodies of water?
Their illness or death indicates pollution in an aquatic ecosystem.
Which will most likely happen to a biological indicator species if there is a sudden increase in pollution?
There will be a significant decrease in the population numbers and the quality of the individuals.
Which organism would make a good boindicator?
an organism that is not sensitive to slight physical or chemical changes
Which most likely makes fish excellent indicators of watershed health?
Fish differ in their tolerance to amount and types of pollution.
Which aspect of stream ecology would be most affected by changes in water temperature?
rate at which algae photosynthesizes
How will high turbidity most likely affect a watershed?
Water temperatures will increase, and dissolved oxygen levels will decrease.
Which does an increase in eutrophication indicate to scientists studying a body of water?
an increase in fertilizer runoff
The word "bioaccumulation" is most often associated with which threat to water?
Fish tank owners will often add ammonia to the tank to increase the nitrate levels. If too much ammonia is added, what might occur?
Algae growth will increase, causing oxygen levels to decrease.
Which would most affect the health of fish in a local pond?
The daily release of hot water into the pond from a local factory.
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