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matter

Matter is anything that takes up space and has mass. Atoms or parts of atoms form all matter. It is everything from the tiniest electron to the planets and stars. ... read more

where did the sand in the sahara desert come from

The sand in the Sahara is a result of rock erosion and weathering. ... read more

why does it hurt so much when you step on a plug

Balancing your body weight on the pins of a plug puts huge pressure on your foot. ... read more

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

galaxies

A galaxy is a system of dust, gas, and stars that collects over a very large area. Gravity binds the objects in a galaxy together. Within each galaxy are billions of stars. ... read more