2nd Grade Clay PowerPoint - Rosa Parks Elementary PTSA

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Transcript 2nd Grade Clay PowerPoint - Rosa Parks Elementary PTSA

2nd Grade Clay
colorful fish
What is clay?
Clay is made of very
fine particles of
decomposed rock that
stick together. Clay
particles are smaller
than pebbles, sand &
even silt.
Clay forms through a process of weathering & erosion.
It can be found in abundance all around the world.
A great place to look for clay is along the banks of existing or dried up river beds.
An artist digging for clay
This eroding cliff shows many types of soils & rock areas of clay are circled.
Greenware to Bisque
• We can use clay to create many things including art!
• When clay is wet, it is easy to mold & form.
The pieces we create are called
• Firing is the term for heating clay in a kiln the special oven used to bake clay.
• The heat from the kiln causes the water to
slowly evaporate from the clay, the clay
particles bond together & the clay becomes
• We call our kiln fired clay pieces bisque
We fire our clay pieces at almost 2000
degrees Fahrenheit!
• What do you think would
happen if we fired a glass
marble in our high temperature
• The kiln temperature is so hot
it would melt that marble into a
puddle of glass!
After 48 hours in the hot kiln, bisque projects are ready
for glaze!
• Glaze is the paint used to color clay projects
• There are small particles of silica in our colorful
glazes, when they are heated in the kiln they will
melt into glass!
Bisque pieces ready to unload
from the kiln & glaze.
Greenware: Unfired clay projects
Bone Dry: Completely air dried clay
Kiln: An oven used for firing clay projects
Bisque: Clay which has been fired once, without glaze
Fire: To heat clay in a kiln
Glaze: Paint used to color clay projects. Glaze turns to glass
when fired in a kiln.