These changes of the earth s appearance and character can be discussed in a variety of ways: development of an atmosphere, formation of land surfaces and continental drift, variation in sea level, sedimentation, mountain-building, volcanism, seasonality, glaciation.
(These changes of the earth s appearance and character; can be discussed; L:in a variety of ways)
These changes of the earth s appearance and character
can be discussed
L:in a variety of ways