Hydrosphere - 8.E.1 Question Preview (ID: 60725)
Post Unit Test For 8th Grade NCSCOS.
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An estuary is
a) the beginning of a river.
b) an abiotic factor of a watershed.
c) a body of water formed where freshwater and saltwater mix.
d) a relatively flat land stretching from either side of a river.
A partially-enclosed coastal region where sea water mixes with freshwater is called a(n) _______.
a) aquifer
b) upwelling
c) estuary
d) hydrothermal vent
Hydrothermal vents, submarine hot springs, and methane cold seeps release heat and chemicals deep below the surface of the ocean. Surprisingly, the areas around these sites are able to support ecosystems. Based on this information, such ocean ecosyst
a) primary producers that create energy from oxidizing chemicals.
b) primary producers that obtain energy from photosynthetic plants.
c) primary consumers that obtain energy from photosynthetic plants.
d) primary consumers that create energy from oxidizing chemicals.
An industrial power plant dumps its heated wastewater straight from a pipe into a stream. This is an example of -
a) Point-source pollution
b) Nonpoint source pollution
c) blah!
d) blah blah!
A process powered by adhesion and cohesion that causes water molecules to move upward through a narrow tube such as the stem of a plant without the use of energy is called:
a) Surface tension
b) Heat of Vaporization
c) Capillary Action
d) Solubility
When the accumulation of rain flows over the parking lots and roads in North Carolina, it washes pollutants into bodies of water. How is the pollution classified?
a) Point source pollution
b) Nonpoint source pollution
c) i don't know!
d) who cares!
About what percent of earth’s water is not ocean water?
a) 10%
b) 97%
c) 3%
d) 1%
Which combination of processes from the water cycle is MOST LIKELY to cause flooding?
a) high runoff, low evaporation, low precipitation
b) low runoff, low evaporation, high transpiration
c) high runoff, low infiltration, high precipitation
d) low runoff, high infiltration, high condensation
Which conditions indicate that a water system is healthy?
a) high dissolved oxygen, low temperature, and high nitrates
b) low dissolved oxygen, high temperature, and low nitrates
c) high numbers of bioindicators, low temperature, and high dissolved oxygen
d) low temperature, low dissolved oxygen, and high numbers of bioindicators
Which best explains why all of the Earth’s freshwater is not available for human use?
a) Most of Earth’s freshwater is only in lakes.
b) Most of Earth’s freshwater is underground.
c) Most of Earth’s freshwater is still in the water cycle.
d) Most of Earth’s freshwater is frozen water.
As the temperature of a body of water increases, which factor(s) will be most affected?
a) dissolved oxygen
b) nitrates and phosphates
c) pH and nitrates
d) turbidity
Heavy rainfall occurs over a farm that had a recent application of fertilizer. What effect will runoff from this farm have on a lake that is located downhill from the farm?
a) It will decrease the turbidity of the lake’s water.
b) It will increase the temperature of the lake’s water.
c) It will decrease the concentration of nitrates and phosphates in the lake’s water.
d) It will increase the concentration of nitrates and phosphates in the lake’s water.
Why is water from an aquifer more likely to be cleaner than water from other sources?
a) A. because it forms where fresh and saltwater meet
b) B. because it receives water directly from precipitation
c) C. because it rises to the surface near the ocean
d) D. because pollutants are filtered by rock and soil deep within Earth
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?
a) A. chemosynthesis
b) B. electrical charge
c) C. hydropower
d) D. thermal heat
Which tool would most likely be used by scientists to explore a hydrothermal vent at the Mid-Atlantic Ridge?
a) buoy
b) remote operated vehicle
c) satellite imagery
d) sonar
If water is recycled in the atmosphere, which best describes why water availability on Earth is decreasing?
a) A. An increase in droughts is slowly reducing freshwater reservoirs.
b) B. Due to an increase in Earth’s temperature, evaporation rates continue to increase reducing liquid water on the surface.
c) C. Earth’s freshwater continues to become more polluted, reducing the supply of freshwater safe for humans to consume.
d) D. none of the above answers are correct.
Which best describes the characteristics of a river basin?
a) A. the land drained by a river and its tributaries
b) B. the land formed when rivers create estuaries and marshes
c) C. the land at the mouth of a river where water flows into the ocean
d) D. the land formed as a result of a river flooding
Which sentence below best explains the process of upwelling?
a) Warm water rises up from deep layers of the ocean to the ocean's surface.
b) Dense water sinks down from the shallow layers of the ocean to the deeper levels.
c) Cold water sinks down from the shallow layers of the ocean to the deeper depths.
d) Cold water rises up from deep layers of the ocean to the ocean's surface.
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