How many elements are there in the periodic table?

What layers make up the Earth?

Which parts of the earth are cracked into a number of large pieces (tectonic plates)?

Why do the tectonic plates move? What speed do they move at every

year?

Describe the nature of the mantle

What has extra carbon dioxide done to the environment (e.g. oceans)?

What happens to the carbon in the air in relation to limestone

Positive aspects of exploiting limestone and producing building materials from it

Negative aspects of quarrying

Evaluate the advantages of exploiting metal ores

What does mining involve?

Disadvantages of mining

What happens if you recycle metals?

Why use/not use metals in building?

Impact on the environment of burning hydrocarbon fuels

Ethanol fuel production

Hydrogen as a fuel

Ethanol as a fuel: Hydration method

Ethanol as a fuel: Fermentation method

BIOFUELS impact

Products of combustion - ethanol

Equation for fermentation

Equation for hydration

What is crude oil used for?

Benefits of using polymers

Cons of using polymers

Comparing ethanol fuel sources

Plant oils - effects on diet and health

Emulsifiers - evaluation

Wegener's revolutionary theory wasn't accepted initially because...

How did life start?

Why can't scientists predict volcanos/earthquakes?