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The Water Cycle
The Water Cycle
evaporation
The Water Cycle
evaporation
condensation
The Water Cycle
evaporation
precipitation
condensation
The Water CycleSnowflakes form at the condensation stage.
The Water CycleSnowflakes form at the condensation stage.
The water vapor condenses directly into ice!
The Water CycleSnowflakes form at the condensation stage.
The water vapor condenses directly into ice!
This process is called
“sublimation.”
Every Every snowflake starts out as the same basic shape.
By the time each snowflake touches the ground, it is
uniqueunique.
Why?
temperature
temperature
Temperature: the measurement of how hot or cold something is.
humidity
humidity
Humidity: the amount of water vapor in the air.
•A snowflake is made of ice crystals.
•A snowflake is tiny.
•A snowflake is made of ice crystals.
•A snowflake is tiny.
•A snowflake is made of ice crystals.
•A snowflake is symmetrical.
•A snowflake is tiny.
•A snowflake is made of ice crystals.
Symmetry – Two Dimensional Polygons
Key words:
Symmetry – Two Dimensional Polygons
Key words:
A regular polygon is a polygon in which all sides are the same length.
Symmetry – Two Dimensional Polygons
Key words:
A regular polygon is a polygon in which all sides are the same length.
A line of symmetry for a polygon is any line on which the polygon can be folded so that one half of the polygon will fall exactly on the other half.
Number of Sides of Regular Polygon
Name of Regular Polygon
Number of Lines of Symmetry
3
4
5
6
Number of Sides of Regular Polygon
Name of Regular Polygon
Number of Lines of Symmetry
3 triangle
4
5
6
Number of Sides of Regular Polygon
Name of Regular Polygon
Number of Lines of Symmetry
3 triangle 3
4
5
6
Number of Sides of Regular Polygon
Name of Regular Polygon
Number of Lines of Symmetry
3 triangle 3
4 square
5
6
Number of Sides of Regular Polygon
Name of Regular Polygon
Number of Lines of Symmetry
3 triangle 3
4 square 4
5
6
Number of Sides of Regular Polygon
Name of Regular Polygon
Number of Lines of Symmetry
3 triangle 3
4 square 4
5 pentagon
6
Number of Sides of Regular Polygon
Name of Regular Polygon
Number of Lines of Symmetry
3 triangle 3
4 square 4
5 pentagon 5
6
Number of Sides of Regular Polygon
Name of Regular Polygon
Number of Lines of Symmetry
3 triangle 3
4 square 4
5 pentagon 5
6 hexagon
Number of Sides of Regular Polygon
Name of Regular Polygon
Number of Lines of Symmetry
3 triangle 3
4 square 4
5 pentagon 5
6 hexagon 6
How many lines of symmetry does Snowflake 1 have? __________
How many lines of symmetry does Snowflake 2 have? __________ What regular polygons are these snowflakes? __________________
•A snowflake is symmetrical.
•A snowflake is tiny.
•A snowflake is made of ice crystals.
•A snowflake is 3 dimensional.
•A snowflake is symmetrical.
•A snowflake is tiny.
•A snowflake is made of ice crystals.
2-Dimensional & 3-Dimensional Objects
2-Dimensional & 3-Dimensional Objects
Circle
2-Dimensional & 3-Dimensional Objects
Circle Sphere
2-Dimensional & 3-Dimensional Objects
Square
2-Dimensional & 3-Dimensional Objects
Square Cube
2-Dimensional & 3-Dimensional Objects
Triangle
2-Dimensional & 3-Dimensional Objects
Triangle Triangular Prism
2-Dimensional & 3-Dimensional Objects
Rectangle
2-Dimensional & 3-Dimensional Objects
RectangleRectangular Prism
2-Dimensional & 3-Dimensional Objects
Hexagon
2-Dimensional & 3-Dimensional Objects
Hexagon Hexagonal Prism
Every Every snowflake starts out as the same basic shape – a
hexagonal prism.
Why?
•1 oxygen atom•2 hydrogen atoms
Do you see the similarities in
shape?
Crystal lattice formed by frozen water molecules
Snowflake
Do you see the similarities in
shape?
Crystal lattice formed by frozen water molecules
Snowflake
Self–assembly:
Self–assembly: a process by which materials build themselves without
assistance.
Self–assembly: a process by which materials build themselves without
assistance.
Snowflakes self-assemble… they build themselves!
How does a snowflake grow?
How does a snowflake grow?
Initial formation of a snow crystal around a dust particle in the cloud.
How does a snowflake grow?
Initial formation of a snow crystal around a dust particle in the cloud.
Crystal grows into a hexagonal prism.
Crystal grows into a hexagonal prism.
How does a snowflake grow?
Initial formation of a snow crystal around a dust particle in the cloud.
Crystal grows into a hexagonal prism.
Crystal grows larger – corners may sprout “arms.”
Crystal grows larger – corners may sprout “arms.”
How does a snowflake grow?
Initial formation of a snow crystal around a dust particle in the cloud.
Crystal grows into a hexagonal prism.
Crystal grows larger – corners may sprout “arms.”
Crystal moves to different temperatures and different levels of humidity – plates may grow arms.
Crystal moves to different temperatures and different levels of humidity – plates may grow arms.
How does a snowflake grow?
Initial formation of a snow crystal around a dust particle in the cloud.
Crystal grows into a hexagonal prism.
Crystal grows larger – corners may sprout “arms.”
Crystal moves to different temperatures and different levels of humidity – plates may grow arms.
Crystal moves through many different temperatures and different levels of humidity – each change may cause new growth in arms.
Crystal moves through many different temperatures and different levels of humidity – each change may cause new growth in arms.
How does a snowflake grow?
Initial formation of a snow crystal around a dust particle in the cloud.
Crystal grows into a hexagonal prism.
Crystal grows larger – corners may sprout “arms.”
Crystal moves to different temperatures and different levels of humidity – plates may grow arms.
Crystal moves through many different temperatures and different levels of humidity – each change may cause new growth in arms.
Natural Snow Artificial Snow
Natural Snow Artificial Snow
•Ice
Natural Snow Artificial Snow
•Ice •Chemical polymer
Natural Snow Artificial Snow
•Ice
•Melts above 32F
•Chemical polymer
Natural Snow Artificial Snow
•Ice
•Melts at 32F
•Chemical polymer
•Does not melt at 32F
Natural Snow Artificial Snow
•Ice
•Melts at 32F
•Edible
•Chemical polymer
•Does not melt at 32F
Natural Snow Artificial Snow
•Ice
•Melts at 32F
•Edible
•Chemical polymer
•Does not melt at 32F
•Inedible
Natural Snow Artificial Snow
•Ice
•Melts above 32F
•Edible
•Hexagonal prisms
•Chemical polymer
•Does not melt
•Inedible
Natural Snow Artificial Snow
•Ice
•Melts at 32F
•Edible
•Hexagonal prisms
•Chemical polymer
•Does not melt at 32F
•Inedible
•No hexagonal prisms
Artificial Snow (magnified 10 times)
Image of magnified artificial snow.
Artificial Snow (magnified 60 times)
Image of magnified artificial snow.
Natural Snow (magnified 10 times)
Need to find a magnified image of natural snow.
All snowflake images courtesy of www.snowcrystals.com
• 8.5” x 8.5” Paper• Scissors• Standard Ruler• Pencil
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