Lesson | Unit.D_Sci.8 - sts.1 | Describe the distribution and characteristics of water in local and global environments
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Science
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8th Grade
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Medium
Anthony Jones
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14 Slides • 27 Questions
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3
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5
Multiple Choice
What percentage of Earth's water is fresh liquid water?
Less than 1%
About 2%
97%
50%
6
Multiple Choice
Where does the majority of Alberta's freshwater come from?
Deserts
Rocky Mountain glaciers
Oceans
Rainforests
7
Multiple Choice
What percentage of Earth's water is salt water in oceans?
Less than 1%
About 2%
97%
50%
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9
Multiple Choice
Which component of Earth's water is described as "massive ice formations that store freshwater and feed rivers"?
Oceans
Groundwater
Glaciers
Lakes and Rivers
10
Multiple Choice
What is the main characteristic of oceans as a component of Earth's water?
They are vast saltwater bodies covering most of Earth.
They are seasonal and permanent ice formations.
They are water held in underground aquifers.
They are surface freshwater sources.
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Multiple Choice
Which component of Earth's water is held in underground aquifers and soil?
Snow and Ice Caps
Groundwater
Lakes and Rivers
Glaciers
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13
Multiple Choice
What does potable water refer to?
Water that is safe for human consumption
Water that is used for agriculture
Water that is found in oceans
Water that is used for industrial purposes
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Multiple Choice
What percentage of Earth's water is readily available for drinking?
Less than 1%
10%
25%
50%
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Multiple Choice
Why is the limited supply of potable water significant?
It highlights the importance of water conservation and protection
It shows that oceans are the main source of drinking water
It indicates that all freshwater is easily accessible
It proves that water is abundant and unlimited
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Multiple Choice
What is the salinity level of fresh water?
High (lots of salt)
Low (little salt)
Medium
None
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Multiple Choice
Where is salt water commonly found?
Rivers
Lakes
Glaciers
Oceans
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Multiple Choice
What is a common use for fresh water?
Desalination
Fishing
Drinking
Industrial cooling
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Multiple Choice
What does clarity/turbidity measure in water?
The concentration of dissolved salts
The concentration of calcium and magnesium ions
How clear or cloudy the water appears
The temperature of the water
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Multiple Choice
What is used to measure salinity in water?
Thermometer
Conductivity meter
pH meter
Color-changing strips
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Multiple Choice
What does water hardness indicate?
The amount of suspended particles
The concentration of dissolved salts
The concentration of calcium and magnesium ions
The temperature of the water
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26
Multiple Choice
What is the main advantage of using test strips for biological water testing?
They provide detailed information about contaminants.
They are quick and easy to use in the field.
They require laboratory equipment.
They take 24-48 hours to complete.
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Multiple Choice
What is required for microscopic examination of water samples?
Color-changing paper strips
Nutrient media
Laboratory equipment and trained technicians
Portable test kits
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Multiple Choice
How long does culture-based testing take to reveal the number and types of bacteria present?
1-2 hours
12-24 hours
24-48 hours
72 hours
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Multiple Choice
What is required for water to be considered microbially safe?
It must be free from harmful bacteria, viruses, and parasites.
It must have a low pH level.
It should contain high levels of dissolved solids.
It should have a strong odor.
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Multiple Choice
Which of the following is a chemical safety requirement for potable water?
High levels of lead and arsenic.
Levels of harmful chemicals must be below established safety thresholds.
Presence of industrial pollutants.
High turbidity.
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Multiple Choice
What do regulatory standards for potable water involve?
Setting legal limits for contaminants based on scientific research.
Ensuring water has a strong color and odor.
Allowing high levels of pesticides.
Ignoring health impacts.
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Multiple Choice
Which process uses solar energy to naturally evaporate water, leaving salt behind?
Distillation
Reverse Osmosis
Evaporation
Electrodialysis
35
Multiple Choice
In which desalination process is water boiled and the resulting steam collected and condensed back into liquid water?
Reverse Osmosis
Distillation
Electrodialysis
Evaporation
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Multiple Choice
What is the role of a semipermeable membrane in reverse osmosis?
It allows salt molecules to pass through.
It blocks water molecules while allowing salt molecules to pass.
It blocks salt molecules while allowing water molecules to pass.
It uses electric current to pull salt ions through.
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38
Multiple Choice
What percentage of Earth's water is saltwater in oceans?
97%
2%
50%
1%
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Multiple Choice
Which process is NOT mentioned as a method to make water potable?
Evaporation
Distillation
Filtration
Reverse osmosis
40
Multiple Choice
Why is water conservation important?
It increases the amount of saltwater.
It is essential for human communities and ecosystems.
It makes water taste better.
It reduces the Earth's temperature.
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