Its comforting to think of
the Earth as a quiet and stable platform. The experience of an
earthquake or a volcano might make us think twice, however. These
events hint at the powerful forces beneath the surface of the Earth
that drive the reshuffling of the continents over the course of
millions of years.
Other physical phenomena affect
conditions on the Earths surface in equally significant ways.
All life has been profoundly
affected by the physical changes that the Earth has undergone
throughout time. In this Lesson, well examine the connections
between the conditions on the Earth and the macroevolution of
Well also explore the
geological time scale, and well find out when some important
events in the history of life occurred.