The Nile is a river that runs through Africa. It is the longest river in the world.
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A plant or animal is sterile if it cannot produce offspring. Something that has no living things on it or that cannot sustain living things is also called sterile. Medical equipment is usually provided in sealed packets that keep it sterile.
Another word for sterile is barren. The opposite of sterile is fertile.
Sundials are a device that uses the sun to tell the time. A sundial is made up of a horizontal dial plate with numbers on it, and a vertical upright called a gnomon. As the sun moves, the shadow cast by the gnomon moves around the dial plate, and you can read the time off what numbers it points to.
Some sundials use a shaft of light rather than a shadow, and the dial plate may be curved not flat. Some sundials have enough information on the dial plate to be able to tell the date as well as the time.
