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What Plants Need to Grow

This film, from Twig World looks at plant nutrition and why nitrates, phosphates, potassium and magnesium are vital for plant health.

The key points in the film are:

•Understanding how plants grow ensures we have food on the table. •Plants need sunlight and air, water and minerals. •If minerals are...

Esters and Perfumes

This film, from Twig World, looks at esters which occur in nature and have been harnessed by the perfume industry. It explores what esters are and how are they made and used.

The key points in the film are:

•Esters give many fruits their scents, including bananas, lavender and pineapples. •They are...

FactPack: Hydrocarbons

This film, from Twig World, provides an introduction to hydrocarbons and looks at how unreactive alkanes can be made into reactive alkenes.

The key points made in the film are facts about Hydrocarbons, for example:

•Hydrocarbons are the simplest organic compounds. •Alkanes are poor fuels, thick and...

Fractional Distillation

This film, form Twig World, looks at how the industrial process of fractional distillation transforms crude oil into a variety of products, from plane fuel to road surfacing.

The key points made in the film are:

•Extraction of crude oil from Fractional Distillation gives us many useful products. •...

Leaded and Unleaded Petrol

This film, from Twig World, looks at the dangers of tetraethyl lead in petrol.

The key points made in the film are:

•Lead was added to fuel to make it better for our engines. •However, lead is a dangerous pollutant. •It is toxic and damages our inner organs. Leaded fuel caused a health scare. •Leaded...

Plastics and Polymers

This film, from Twig World, looks at how plastics are made and how they can be manipulated to have very different functions.

The key points made in the film are:

•Plastics are synthetic materials called polymers. •Polymers are made of small molecules called monomers obtained from crude oil. •The...

Recycling Plastics

This film, from Twig World, looks at the differences between thermosetting, thermosoftening and partially biodegradable plastics, and how they can be recycled. The key points made in the film are: •We throw away a lot of plastic and most is non-biodegradable. •It can be recycled using mechanical and chemical...

Vegetable Oils As Fuel

This film, from Twig World, looks at the processes involved in using vegetable oil as a biofuel and whether it could become a viable alternative to fossil fuels.

The key points made in the film are:

•Vegetable oil is made of long chains of carbon atoms similar to diesel oil or gasoline. •Vegetable...

Ordnance Survey Maps

This film, from Twig World, looks at the history of ordnance survey maps. Ordnance Survey has been creating maps for hundreds of years. How have their mapping methods changed since the first Ordnance Survey maps were made?

The key points made in the film are:

•The British Ordnance Survey team are the...

Time Zones

This resource, from Twig World, looks at time zones around the planet and how these changes affect people.

The key points made in the film are:

•There are 24 time zones, which are regions on Earth that are bound by longitudinal lines. •Local time depends on what time zone you are in. •The system of...

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