In attempting to make sense of the earth's motion, particularly its position in the space (regardless the significance of the term at the time), people have spent uncalculated amount of efforts to make observations throughout the history. ... The reward is sets of mathematics-based observations, including providing an explanation to epicycles, circular planetary orbits around the sun and finally, the establishment of the heliocentric theory. ... He had all formerly discovered planets orbit around the sun in exactly the same position as Copernicus', yet persisted the traditional eart...

• Word Count: 620
• Approx Pages: 2
• Grade Level: Undergraduate

The earth's water source is in unvarying change due to climate, cloud formations, precipitation, the roles of the oceans and the sun, as well as a variation of gases. ... The earths geologic history details why sea level changes have continually changed due to the eustatic process and the and the isostatic process. ...

• Word Count: 763
• Approx Pages: 3
• Grade Level: Undergraduate

Every glimpse upward to the clouds, the sun, the stars, and the moon made us feel fortunate of being alive and enjoy the majestic beauty of our earth..." ... During all its history, immigrants from around the world have come to this country pursuing the American Dream. ...

• Word Count: 1124
• Approx Pages: 4
• Grade Level: Undergraduate