When Was the First Interstellar Radio Message Sent?
When Was the First Interstellar Radio Message Sent? The Arecibo Message, humankind’s first interstellar radio message, sent from the Arecibo Observatory in Puerto Rico...
Read More
Why Are There Many Kinds of Soils?
Why Are There Many Kinds of Soils? Soil is one of the principal substrata of life on Earth, serving as a reservoir of water and nutrients, as a medium for the...
Read More
When Did the Rift Valleys Form?
When Did the Rift Valleys Form? The great rift valleys of the earth took shape during the pleistocene age, about two million years ago. They were caused mainly by...
Read More
Why Is There More Sea than Land on the Earth’s Surface?
Why Is There More Sea than Land on the Earth’s Surface? The answer to this question lies in the composition of the rocks which make up the outer portion of the earth’s...
Read More
When Were the Ice Ages?
When Were the Ice Ages? The Ice Ages ended about 10,000 years ago after lasting about two million years. At its greatest extent the ice covered nearly 30 per cent of...
Read More