A resource that it is used up faster than it can replace itself is

• Renewable
• Non-renewable
• ecological footprint
• in need

Which of the following is a nonrenewable resource?

• Trees
• Coal
• Wind
• Sunlight

A type of air pollution caused by the interaction of sunlight with pollutants.

• Smog
• Particulates
• Acid Rain
• Greenhouse gas

Acid rain has a higher pH level than normal rain.

• True
• False

This gas makes up 21% of the atmosphere

• ozone
• oxygen
• nitrogen
• water vapor

This gas makes up 78% of the atmosphere

• oxygen
• nitrogen
• ozone
• carbon dioxide

What is a hydrocarbon?

• A substance that contains hydrogen and carbon.atoms.
• A substance that contains hydrogen and carbon atoms only.
• A substance that contains hydrogen, carbon and oxygen atoms.
• A substance that contains single covalent bonds only.

The process that separates crude oil into its useful fractions is called .....

• Cracking
• Combustion 
• Fractional Distillation
• Neutralisation

The first shell holds how many electrons? 

• 1
• 2
• 3
• 4

The second shell contains how many electrons?

• 6
• 7
• 8
• 5