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Find out more... Gymnosperms
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The cypress tree is a conifer of the northern temperate region. It is evergreen with needle leaves. The yew tree can reach up to 20 m in height and can live for 1500 years. Firs are especially abundant…
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Tiching explorer Organización
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Resource consisting of a logical problem which we have to solve. We are provided with the solution.
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Concrete is a mixture of cement, sand, gravel and water. It is used a lot in construction. To shape the concrete, the wet mixture is poured into a wooden or steel frame until it dries and becomes hard…
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We obtain the vitamins and minerals we need by eating a balanced diet that includes fresh fruit and vegetables. These are the most important vitamins:
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Analogue thermometers work due to the changes in volume in their column of liquid. Thermometers have a glass tube with a liquid that dilates when it heats up and contracts when it cools down. The…
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The surface of a leaf has many tiny holes in it, called stomata. These allow carbon dioxide and oxygen to flow in and out of the leaf so that photosynthesis and respiration can occur.
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Our sense of balance is also located in the ear. This sense tells us about the position of the head and its movements. It consists of liquid-filled structures in the inner ear with specialist sensory…
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Our alimentary canal is covered by a layer of muscles. When these muscles contract, they move our food forward. This is why we can swallow and digest food while we are lying down.
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Boiling and evaporation are different processes. Both change a liquid to a gas, but happen in different ways. Water boils at 100°C. During boiling, the total volume of liquid water is changing to water…
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A mineral is a natural chemical substance with a particular shape, colour and hardness. We can identify minerals by these characteristics. 
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