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habitats

Life on Earth is delicate. There needs to be a balance between the environment and living things. A habitat is where certain types of animals and plants usually live. Some habitats are as small as the shade under a rock. Most habitats are larger areas. They may contain many species of plants and anima... read more

if a nucleus were the size of a marble how big would the atom be

If an atom’s nucleus were the size of a marble, the atom would be over 120 metres across. ... read more

why do oily things stain clothes

Removing stains straight away helps to prevent them reacting with the air. ... read more

why don’t grains of salt stick together

Common table salt doesn’t clump thanks to the addition of anti-caking agents. ... read more

how do polarised sunglasses work

Polarised sunglasses have filters that block some light waves while letting others through. ... read more