Download - Color swirls
Color Swirls
NGSS
Students use a model to investigate how temperature-driven density changes can cause convection in a fluidStudents use evidence to construct an explanation of how temperature-driven density changes can cause convection in a fluid
Which square has more dots?Which square is bigger?
square 2
square 1
square 2
square 1
Both squares have the same number of dots in a given amount of space
Which square has more dots?Which square is bigger?
square 2
square 1
square 2
square 1
Both squares have the same number of dots in a given amount of space
Which ball has a higher density?
golf ballping pong ball
Convection
COOLING
HEATING
Wikimedia Commons
Convection cell
Convection cell
Convection drives plate tectonics
Convection creates wind
CER TableCLAIM
What do you know?EVIDENCE
How do you know that?
REASONINGWhy does your evidence
support your claim?
Warm water rises.The red food coloring moved up after being warmed by the candle.
The red food coloring sat on the bottom of the bowl until it was heated by the candle.
Warm water is less dense.
The blue food coloring on the sides of the bowl sank to the bottom.
There is an instability in this system.
The water in the bowl eventually turned purple.