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8th Grade Review - Earth Systems (Water Unit) 2nd set
Terms in this set (45)
Marine organisms on the deep ocean floor can withstand tremendous pressue, high temperaures, utter darkness and toxic chemicals. What are they called?
What term describes the clarity of water?
Deep sea ___ and seeps provide habitats for organisms that can live in freezing cold, dark, high in pressure, and have toxic chemicals.
Studying organisms at ___ vents helps us understand how life first took hold and slowly evolved on our planet and where it might exist elsewhere in the Solar System.
Sunlight provides energy that allows plants to convert carbon dioxide and water into the organic carbon, the fundamental source of nutrients for animals higher up the food chain. What is the process called?
Animals such as clams, mussels, snails, and shrimp feed on ___, and in turn, provide food or fish and other predators.
Below the photic zone, many microbes have evolved ___ processes that create organic matter by using oxygen in seawater to oxidize hydrogen sulfide, methane, and other chemicals present in vent and seep fluids.
Some vent and seep animals, such as tubeworms and shrimp are host chemosynthetic microbes that provide a place for microbes to live in exchange for their __.
Hydrothermal vents are driven by heat from __ beneath the seafloor.
__ __ produce a diffuse flow of lower-temperature fluids, often composed of natural gas and a mixture of hydrocarbons at slower rates for longer periods.
The __ seeping from the seafloor sustains microbes that serve as the base of the food chain for communities of animals which thrive in the sunless depths.
Potable water is water that is __ to drink.
Temperature, turbidity and water movement are __ (physical/ chemical/ biological) variables that determines the health of water.
Dissolved oxygen and other gases, pH, nitrates and salinity are __ (physical/ chemical/ biological) variables that determines the health of water.
Testing of nutrients and pesticides are a normal part of public health maintenance and ___ of freshwater sources.
Safe water can be used for bathing or cleaning, while ___ water is safe for drinking.
The ___ in the US sets the maximum levels for the 90 most commonly occurring contaminants.
Temperature determines what organisms can survive in water environments. ___ (warm / cold) water dissolves more of a solid substance, but less of important gases like oxygen and carbon dioxide.
Temperature determines what organisms can survive in water environments. Very warm water may not contain enough dissolved ___ for aquatic life to survive.
DO stands for ___ ___.
High ___ levels in potable water make it taste better.
Diffusion of ___ and a waste product of photosynthesis by aquatic plants puts oxygen in water.
___ is important because it controls many chemical and biological processes that occur in the water. (Hint: measure of how acidic or basic water is)
0 to 14
The range of the pH scale is __ to __
high / strong
0 pH indicates a ___ (high/low) concentration of positive hydrogen ions, making it ___ (strong / weak) in acidity.
negative / basic
14 pH indicates a high concentration of __ (negative / positive) hydroxide ions, making it strongly (basic / acidic)
pH has a ___ effect, meaning the impact of other materials (ex: iron, aluminum, ammonia, mercury) in a body of water is amplified or diminished
When ___ (acidic / basic) waters come into contact with certain chemicals and metals, it makes these chemicals and metals more poisonous than normal.
Possible sources of harmful chemicals such as ___ are runoff contaminated with fertilizers, septic tank leakage, sewage, and erosion of natural deposits.
Possible sources of harmful chemicals such as ___ usually enter waterways from human and animal waste, laundry, cleaning and industrial effluents.
The more suspended solids there are in a water sample, the less ____ it is. (Hint: being able to see through it)
Would high turbidity or low turbidity lead to organic pollution that might include pathogenic materials, increased water temperatures, low dissolved oxygen, and physical impairment of aquatic organisms?
Macroinvertebrates are used as ____ for water quality.
Bioindicators include ____ (living / non-living) macroinvertebrates.
___ are easy for people to collect and identify and are sensitive to pollution in water making them good indicators of whether or not a body of water is livable.
Clear water may contain odorless, tasteless, and colorless harmful ___.
Contaminants of water can be ___, nitrates, arsenic, and more.
Humans have developed water ___ to process water since it is limited in supply.
A water treatment step in which lime and alum are added to water, causing particulates to clump together is called ___.
In water treatment, after coagulation water is shaken to form larger clumps called ___.
During the ____ process of water treatment, water stands for approximately 24 hours, which allows the clumps to settle to the bottom.
Later in water treatment, it is filtered and disinfected, usually with ___.
The final step in water treatment after being disinfected, it is ___.
Substances removed during drinking water treatment processes include suspended solids, bacteria, algae, viruses, fungi, minerals, and chemical ___.
Cultivating an awareness of the importance of monitoring and maintaining water ___ awareness in connection to North Carolina's hydrologic system is the first step towards developing stewardship skills and dispositions in students.
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