W hat causes the long-term changes leading to an ice
Factors that are thought to play important roles in
long-term changes in Earth's climate over millions
or tens of millions of years are
in the positions of the continents
in the energy output of the sun
in atmospheric carbon dioxide concentration
in volcanic activity
of the biosphere
2) What causes the glacial cycles within an ice age?
During an ice age, the shorter-term cycles of
advancing and retreating glaciers are thought to be
driven by regular, predictable variations in Earth's
orbit and orientation relative to the Sun.