Make a fossil: a funny experiment

Plastic: a modern material

Plastic is an inexpensive and versatile material which is used to make many objects. For example, it is good for making containers because is resistant to chemical changes. It is also a good insulator since it does not conduct electricity.
There are different types of plastics, such as:

• Polystyrene, for making plastic bags.
• Expanded polystyrene, for packing and containers.
• Bakelite, an insulating material for making pot handles.
• Rubber, for making car or bikes tyres.
• Polyester, for making clothes.

However, not everything about plastic is good. Plastic is not biodegradable. This means it remains in nature for several hundred years, polluting the environment. To reduce this pollution, people have started to recycle plastics instead of just throwing them in the rubbish bin.

NATIONAL PARKS

National Parks are created in natural areas where one or more ecosystems are unspoilt by human activities . The plants and animals in these ecosystems are of special interest.
In National Parks, special steps are taken to protect the landscape, flora and fauna.
In 1872, the United States created the first National Park in the world: Yellowstone National Park. In Spain, the first National Park, Mount Covadonga, was created in 1918. It is now renamed the Picos de Europa National Park.
At present, there are fourteen National Parks in Spain. They offer the best examples of Spain´s natural heritage: Aiguestortes and Estany of Sant Maurici, the Cabrera Archipelago, Cabañeros, Caldera de Taburiente, Doñana, Garajonay, the Atlantic Islands of Galicia, Monfragüe, Ordesa and Mount Perdido, Picos de Europa, Sierra Nevada, Tablas de Daimiel, Teide and Timanfaya.