Lesson 1
Where is most of Earth's water located?
In the oceans.
The _____ of freshwater is greatest at 4 degrees Celsius.
Density.
What is an example of point-source pollution?
A smokestack or a drain-pipe
The amount of thermal energy needed to raise the temperature of 1kg of a material by 1 degree Celsius
Specific Heat
How does water get from one part of the water cycle to the next
By changing state.
Why does an ice cube float in a glass of water?
Ice is less dense than water.
What is turbidity?
The cloudiness of water
The process of a gas changing to a liquid
Condensation.
What is the ratio of freshwater to saltwater on Earth?
3% fresh, 97% salt
What gives water its unique properties?
Its molecular structure (its polarity)
What causes an algal bloom?
Too much nitrate in the water.
What is the formula for density?
D = M/V
What are the three biological functions of water?
Transport of nutrients to and waste away from the cell.
Photosynthesis.
Body temperature regulation.
How does an ice layer on a lake help the fish in the lake survive in winter?
The ice creates an insulating layer, keeping the water below at 4 degrees Celsius.
Would more waste be broken down in water during the summer or winter?
More waste would be broken down during the winter.
(This is because warmer water can hold less oxygen than cold water)
What is cohesion?
the attraction among molecules that are alike.
Which property of water affects climate in coastal areas?
Specific Heat.
Which property allows water molecules to attract each other?
Polarity.
_____ includes a measure of the bacteria present in water.
Water quality.
What are the 5 things scientists can measure about water quality?
Temperature, Acidity, Turbidity, Nitrate levels, and Oxygen levels.