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hi Dorothy moody
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i like maya
pyramids
well, the simplest answer is protection, then later on technological advances have proved it obsolete.
The biggest technological advances, between 1950 and 2004, were advances in computer sciences. Technical advances in communications are also considered to be important.
the advances Egyptians made paper, and the system of hieroglyphs
there main technological advance was figuring out how to do it
The biggest technological advances, between 1950 and 2004, were advances in computer sciences. Technical advances in communications are also considered to be important.
tv
Building the Great Wall of China. The discovery/invention of fireworks. The invention of spaghetti.
technological advances and enviromental incidents have encouraged scientists to look at earth as a system.