The water cycle (also known as the hydrologic cycle) is the journey
water takes as it circulates from the Earth to the sky and back
Most waves are caused by the wind.
WEGENER, ALFRED L.
Alfred Lothar Wegener
(1880-1930), the German geologist and meteorologist, proposed the
in his 1915 book, On the Origin of Continents and Oceans.
This theory states that parts of the Earth's crust slowly drift atop
a liquid core. The
overwhelmingly supports and gives credence to the theory of
continental drift (and that of
He proposed the existence of the supercontinent
named it (Pangaea means "all the land" in Greek). Wegener froze to
death while heading an expedition crossing the Greenland ice cap in