Factors That Cause Rusting

What is rust?

• A type of plastic

• A red or brown coating on metal

• A shiny metal

• A type of water

Which of the following metals rusts easily?

• Gold

• Copper

• Iron

• Aluminium

Which two things are needed for rusting to happen?

• Water and oil

• Air and sunlight

• Water and air

• Fire and smoke

What gas in the air causes rusting?

• Oxygen

• Helium

• Carbon dioxide

• Nitrogen

What is the colour of rust?

• Blue or green

• Black or grey

• Yellow or white

• Red or brown

Where does rusting happen?

• On plastic surfaces

• On wooden surfaces

• On metal surfaces

• On paper surfaces

Why does metal rust faster near the sea?

• Because the sea is cold

• Because the air is fresh

• Because salty water speeds up rusting

• Because there is no oxygen

Which of the following will help prevent rust?

• Leaving metal in the rain

• Painting the metal

• Washing metal in saltwater

• Scratching the metal

What happens to an iron nail left in water for a long time?

• It melts

• It shines

• It becomes rusty

• It becomes soft

Why should we prevent rusting?

• To make metal dirty

• To waste metal

• To keep metal strong and last longer

• To make more rust