The
Atmosphere is 79% nitrogen, 20% oxygen, and 1% other
trace gases. The Earth's surface is active,
constantly destroyed and renewed
in large sections. This is called plate tectonics. Plate tectonics: slow motion
of large pieces of crust. Water and oceans. LIFE !!! Distance to the Sun = 1 AU.
Average density = 5.5 gm/cm3. Radius =6378km. Mass =6x1024kg
Hawaii Islands: 
Antarctica:
Canyons, Volcanoes, and Mountains as viewed from space:
Canyons:
Volcanoes:
Mountains:
