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When
three celestial objects become aligned, an eclipse is said to occur.
The many eclipse events known to astronomers are of two different
types. In the first, the eclipsing body comes between an observer and
the eclipsed object. The eclipsed object appears to the observer to be
totally or partially covered by the eclipsing object. Eclipses of the
second type affect only planets or natural satellites. In this case,
the eclipsing body comes between the sun and the eclipsed object. The
eclipsed...
Sunday, 19 January 2014
Posted by Unknown on 8:40 pm with No comments
One
of the most familiar and important forms of energy is light. Nothing is
visible to humans when light is totally absent. But light is even more
important for other reasons. Many scientists believe that millions of
years ago light from the sun triggered the chemical reactions that led
to the development of life on Earth. Without light the living things
now on Earth would be unable to survive. Light from the sun provides
energy for life on Earth. Plants change the energy of sunlight into
food energy. When light rays strike a green plant,...
Posted by Unknown on 8:38 pm with No comments
Between Israel and Jordan lies the Dead Sea, a salt lake located on the lowest point of the
Earth's surface. Its basin lies some 1,300 feet (400 meters) below sea
level, making it the lowest body of water in the world. The lake is
about 50 miles (80 kilometers) long and 11 miles (18 kilometers) wide.
Its surface area is about 394 square miles (1,020 square kilometers).
The
Dead Sea extends from north to south in a great depression between
rocky cliffs. The depression is a rift valley, caused by the Earth's
crust having slipped down between...
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