GEOLOGICAL MAP OF THE UNITED STATES SHOWING THE REGIONS OF REPRESENTATIVE FORMATIONS
[Large illustration] (310 kB)
![[Large illustration]](#535149607468238645_fig0072_lg.jpg.id-5091927377012157245.wrap-0.html.html){kind=link}
THE SURFACE OF THE EARTH
MAP SHOWING THE DISTRIBUTION OF LAND AND WATER
[Large illustration] (222 kB)
![[Large illustration]](#535149607468238645_fig0073_lg.jpg.id-2214453262837437845.wrap-0.html.html){kind=link}
LAND FORMS OF THE WORLD
The proportion of land to water upon the earth is as 27 to 72, or roughly one-fourth to three-fourths; the land covering fifty-three million square miles, the sea one hundred and forty-four million. The land consists of six great bodies called continents, and a multitude of small fragments called islands, which skirt the shores of the continents or dot the broad expanse of the sea.