II 5/20
4100
7th
3470
Which best describes the surface of the earth over billions of years?
High mountains
stay side by side
for billions of
years with little
change
High mountains
gradually wear
down until most
of the earth is at
sea level
Flat surface is
gradually pushed
up into higher
and higher
mountains until
the earth is
covered with
mountains
High mountains
gradually wear
down as new
mountains are
continuously
being formed,
over and over
again