Mostly solar variability and changes in green-house gasses;
but changes in Earth's orbit over time also has an effect.
Earth's precession
Climate
Earth's ice ages are primarily thought to be caused by variations in the Earth's orbit and tilt, known as Milankovitch cycles. These cycles affect the amount and distribution of sunlight reaching the Earth, leading to fluctuations in global temperatures and the growth or retreat of ice sheets. Additional factors such as changes in greenhouse gas concentrations and volcanic activity can also influence the onset and duration of ice ages.
it's warmer and drier now, than during the Ice Ages
is mount novarupta responsible for any of earths surface changes
Ice Ages - band - was created in 1994.
.....After.....
by ice melting
Over time, their have been many ice ages
The cycles resulting from changes in Earth's movements are called Milankovitch cycles. These changes in Earth's orbit and axial tilt can affect the amount and distribution of sunlight reaching the Earth's surface, potentially leading to ice ages.
hydrosphere
Ice ages are periods of extensive glacial activity, impacting Earth's climate and geography by advancing and retreating ice sheets. During ice ages, glaciers can reshape landscapes, carve valleys, and deposit sediments, influencing the physical geography of regions they cover. Additionally, ice ages can cause sea levels to drop as water is stored in glaciers, exposing new land bridges and altering coastlines.