5 properties of materials
strength, flexibility, elasticity, magnetic attraction, absorbency
humans first used metals about _________ years ago.
5.000
this picture shows that the metal gets _________
corrosion
these rocks may contain _________ ore.
iron
A type of plastics made from vegetable oil and corn starch is called
bioplastics
What is the most malleable metal?
gold
A poisonous type of metal is
lead
Thales of Miletus is a __________ (Greek / Canadian) philosopher who noticed the magnetic force on a natural stone.
Greek
Natural magnet comes from __________
lodestone
The type of magnet which can only last for a short time is___________
temporary magnet
This rock contains __________ ore.
gold
2 uses of magnets
to find direction as in a compass, to run electrical devices and machines
