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2 uses of magnets
to find direction as in a compass, to run electrical devices and machines
This rock contains __________ ore.
gold
The type of magnet which can only last for a short time is___________
temporary magnet
Natural magnet comes from __________
lodestone
Thales of Miletus is a __________ (Greek / Canadian) philosopher who noticed the magnetic force on a natural stone.
Greek
A poisonous type of metal is
lead
What is the most malleable metal?
gold
A type of plastics made from vegetable oil and corn starch is called
bioplastics
To make a metal, we take the mineral from rocks and then ________ it.
molten
1 natural metal
gold, silver, copper, iron
these rocks may contain _________ ore.
iron
this picture shows that the metal gets _________
corrosion
humans first used metals about _________ years ago.
5.000
5 properties of materials
strength, flexibility, elasticity, magnetic attraction, absorbency
4 properties of materials
lightness, magnetic, elasticity, conductivity to heat / electricity
2 properties of materials
strength, flexibility
Metals are made from ________ taken from rocks
ores
Rocks that are made from mixed components are called ________
Sedimentary
Rocks that have layers are __________ rocks.
Metamorphic
Ingenious is take from a Latin word "Ignis" that means _________
fire
copper and zinc can create _________
brass
copper and tin mix can create ________
bronze
iron and carbon mix can create ________
steel
3 examples of alloys
steel, bronze, brass
3 types of ore ________
gold, copper, iron ores
Rocks contains much of ________
mineral
Why do people create alloys?
to make stronger materials and to avoid corrosion / rust
By mixing 2 or more metallic elements, we can make an __________
alloy
5 Natural materials
gold, rubber, iron, cotton, wood
3 manmade materials
steel, plastic, fiber
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