An important new industry, oil refining, grew after the Civil war....
Icebergs are among nature's most spectacular creations, and yet most people have never seen one....
From this cartoon, we can see that at the top end of the river,is a chemical factory and a paperrnaking factory which send out and poisonous wastes....
The first fifty years of the next millennium will be critical for the world...
The history of life on earth has been a history of interaction between living things and their surroundings....
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The history of life on earth has been a history of interaction between living things and their surroundings....
Researchers have studied the connection between money and happiness....
Lots of vegetable and meat, which may gain us healthier bodies in the new century....
Television is now playing a very important part in our life....
From this cartoon, we can see that at the top end of the river,is a chemical fac...
Topaz is a hard, transparent mineral. It is a compound of aluminum, silica, and ...
Now that I am no longer young, I have friends whose mothers have passed away....
The concept of obtaining fresh water from icebergs that are towed to populated a...
Indicated above are pictures that show trees play a vital role in water and soil...
The preservation of embryos and juveniles is a rate occurrence in the fossil rec...