Eustatic change happens due to
changes in the amount of ice, as a result of thermal expansion and tectonics
This change will be global
Changing amounts of ice
At the end of the last ice age 10,000 years ago global sea level rose rapidly due to
melting ice creating well-known waterways like the English Channel
Sea levels may also decrease when ice forms, locking water away in the ice sheets and glaciers
Thermal expansion
Thermal expansion occurs as water warms, warmer fluids expand to take up a greater volume
Tectonics
Magma rising to the surface lifts the crust and reduces the capacity of the oceans causing sea levels to rise