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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

the universe

The universe is everything. It contains all galaxies, stars, planets, and matter that have ever existed or ever will exist. Everything you can possibly think of is part of the universe. The cosmos is another word for universe. It is impossible to imagine the size of the universe. Think of words like h... read more

how are the seeds removed from seedless grapes

Seedless grapes are in fact cloned from genetically defected grapevines. ... read more

animal adaptations

Animals have to adapt to the world in which they live in order to survive. Every species of animal has a different way of surviving. Species develop better ways of dealing with their environment over time. Traits that help an animal survive are passed on to the next generation. Traits that are not nee... read more

how the body work

All the organs and systems of your body work together. When they work correctly you move, you fight off germs and diseases, you heal, you learn, you grow, and you age. In other words, you live. ... read more