In this activity, students explore density through investigating the properties of water in an estuary.
Saltwater is more dense (heavier), than freshwater because of the salt it contains. When river water pours out in an estuary and mixes with ocean water, the less dense (lighter) sits on the surface of the salt water until the ocean or tidal currents mix the two.
Describe how salt affects the density of water.
List a variety of organisms which live in the marine and estuarine environment and describe how they are connected.
List and describe ways in which we all can be ocean stewards.
Per student:
two clear plastic cups with about 1/2 cup of water in each
one larger clear cup (empty)
eyedropper
two colours of food colouring
3 tablespoons of salt
NOAA’s National Ocean Service Education | Estuaries
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Survivors
Artist: Jeff Kulak
Jeff is a senior graphic designer at Science World. His illustration work has been published in the Walrus, The National Post, Reader’s Digest and Chickadee Magazine. He loves to make music, ride bikes, and spend time in the forest.
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Egg BB
Artist: Jeff Kulak
Jeff is a senior graphic designer at Science World. His illustration work has been published in the Walrus, The National Post, Reader’s Digest and Chickadee Magazine. He loves to make music, ride bikes, and spend time in the forest.
About the sticker
Comet Crisp
Artist: Jeff Kulak
Jeff is a senior graphic designer at Science World. His illustration work has been published in the Walrus, The National Post, Reader’s Digest and Chickadee Magazine. He loves to make music, ride bikes, and spend time in the forest.
About the sticker
T-Rex and Baby
Artist: Michelle Yong
Michelle is a designer with a focus on creating joyful digital experiences! She enjoys exploring the potential forms that an idea can express itself in and helping then take shape.
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Buddy the T-Rex
Artist: Michelle Yong
Michelle is a designer with a focus on creating joyful digital experiences! She enjoys exploring the potential forms that an idea can express itself in and helping then take shape.
About the sticker
Geodessy
Artist: Michelle Yong
Michelle is a designer with a focus on creating joyful digital experiences! She enjoys exploring the potential forms that an idea can express itself in and helping then take shape.
About the sticker
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Artist: Ty Dale
From Canada, Ty was born in Vancouver, British Columbia in 1993. From his chaotic workspace he draws in several different illustrative styles with thick outlines, bold colours and quirky-child like drawings. Ty distils the world around him into its basic geometry, prompting us to look at the mundane in a different way.
About the sticker
Western Dinosaur
Artist: Ty Dale
From Canada, Ty was born in Vancouver, British Columbia in 1993. From his chaotic workspace he draws in several different illustrative styles with thick outlines, bold colours and quirky-child like drawings. Ty distils the world around him into its basic geometry, prompting us to look at the mundane in a different way.
About the sticker
Time-Travel T-Rex
Artist: Ty Dale
From Canada, Ty was born in Vancouver, British Columbia in 1993. From his chaotic workspace he draws in several different illustrative styles with thick outlines, bold colours and quirky-child like drawings. Ty distils the world around him into its basic geometry, prompting us to look at the mundane in a different way.