Final answer:
Eustatic change refers to worldwide sea level changes due to water volume, while isostatic change refers to local sea level changes caused by crustal movements. Eustatic change is influenced by factors like climate change and melting glaciers, while isostatic change is influenced by tectonic processes like uplift or subsidence of landmasses.
Step-by-step explanation:
The difference between eustatic and isostatic change lies in the causes and effects on sea level. Eustatic change refers to the worldwide changes in sea level due to changes in the volume of water in the oceans and the ice sheets. It is primarily driven by factors such as climate change, melting glaciers, and thermal expansion of seawater.
On the other hand, isostatic change refers to the local changes in sea level caused by vertical movements of the Earth's crust. It is influenced by tectonic processes, such as uplift or subsidence of landmasses. Isostatic changes can occur independently of eustatic changes.
For example, during an ice age, eustatic change would be reflected in a decrease in overall sea level due to the formation of extensive ice sheets, while isostatic change could cause localized sea level changes as landmasses experience vertical uplift or subsidence.