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how were hieroglyphics finally decoded

Hieroglyphics proved diffi cult to work out, despite hundreds of years worth of attempts. The Rosetta Stone, discovered in the city of Rashid (Rosetta), Egypt, in 1799, provided final clues. The stone’s text was in two languages but three scripts: Greek, hieroglyphic and demotic (a cursive hieroglyp... read more

weather

We talk about the weather every day, but what exactly is it? We can define it as the state of the atmosphere. The amount of wind, the temperature, the moisture, and cloudiness are some of the things that make up weather. ... read more

compounds, acids and bases, mixtures, and solutions

Every material is made of either a pure substance or a combination of substances. A substance is pure if it contains only one type of element. An element is a substance made up of all of the same type of atoms. Oxygen is a pure substance. It only contains oxygen atoms. Elements combine in several ways... read more

the solar system

A solar system is a group of planets and one or more stars. Our solar system has just one gigantic star, the Sun. It also has eight planets and three dwarf planets. Many planets have their own moons. There are also thousands of asteroids, meteoroids, and comets. Gravity from our huge Sun holds the sol... read more

what is an animal

Animals are living creatures. They include very small creatures such as dust mites and very large creatures such as whales. Animals are multi-cellular organisms that eat food to survive. They cannot get energy from the sun like plants do. Most animals can move on their own. ... read more