The realization that Earth was a sphere
was made by Isaac Newton.
had to wait until the modern era (1800s).
was first made by Pythagoras, 580–500 B.C.
did not occur in Europe until the first voyages of Columbus.
The basis for defining the length of a day is the fact that
Earth does not rotate; rather, it revolves.
Earth moves through 365.25 days a year in its orbit about the Sun.
Earth rotates on its axis in 24 hours; i.e., it rotates 15° of longitude per hour.
Earth rotates east to west.
Which of the following is TRUE of the 1884 international treaty establishing the prime meridian
(0°)?
The United States designated the Washington meridian for land maps and marine maps.
No consensus was met at the 1884 treaty, putting off the decision until a 1907 treaty was
passed.
Each country selected its own prime meridian for their marine maps.
The Greenwich meridian was established as the prime meridian by the treaty.
Which of the following is TRUE of the biosphere?
It extends from the floor of the oceans to 8 km (5 mi.) into the atmosphere.
It is static, never to rarely changing.
It is not connected to the overlapping inorganic spheres.
It is never referred to as the ecosphere.