Greenhouse Effect, Ozone

A series of free Science Lessons for 7th Grade and 8th Grade, KS3 and Checkpoint Science in preparation for GCSE and IGCSE Science.

Greenhouse Effect and Global Warming
The sun, greenhouse gases, the effects of fossil fuels on the carbon dioxide concentration in the atmosphere.
Tips to help against global warming are: saving electricity, recycling and helping plant trees.

The Ozone Layer
Ozone layer on the mend, thanks to chemical ban.
Restrictions on chemicals credited in ozone-hole shrinkage.

Try out our new and fun Fraction Concoction Game.

Add and subtract fractions to make exciting fraction concoctions following a recipe. There are four levels of difficulty: Easy, medium, hard and insane. Practice the basics of fraction addition and subtraction or challenge yourself with the insane level.

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