What is the property of towel that makes it useful to us?
absorbency
What do you call the property of a material to float or sink on water?
buoyancy
Why do oil float on top of the water?
Its density is less than the density of water.
What property of a material refers to its ability to decay over time?
biodegradability
How is this object useful to us?
It helps us float on water and keeps us from drowning.
What is this material that can hold water without absorbing it?
pail
Give the three properties of materials that we discussed.
absorbency, buoyancy, and biodegradablity
Given an example of a non-biodegradable material.
Answer may vary.
What do fruits, vegetables, and meat have in common?
They are all biodegradable.
What kind of materials sink on water?
Objects made of metal.
What object can be recycled into a flower vase?
plastic container or can
TRUE or FALSE: Biodegradable materials take years to decay.
FALSE
TRUE or FALSE: Bacteria can cause food to turn bad.
TRUE
TRUE or FALSE: Absorbent materials like paper bags can protect our things when it is raining.
FALSE
TRUE or FALSE: When a material decays, it usually changes in color and odor.
TRUE
