Eustatic and isostatic sae level changes

Question 1

What is eustatic change

Answer 1

-global in sea level change - rise OR fall

Question 2

What is isostatic change

Answer 2

• a local rise or fall in a sea-level - depends if they were glaciated
• change in land relative to the sea

Question 3

What is the causes of a eustatic rise

Answer 3

• water expands when hot

- climate warms - glacial melt

Question 4

What is the cause of eustatic fall

Answer 4

• gets cooler - ice gets formed - hydro cycle slows

- contraction - water gets smaller

Question 5

What is the cause of sea levels rising isostatically

Answer 5

-land is pushed down - sediment or mass pushing down - glacial ice

Question 6

What is the cause of sea levels falling isostatically

Answer 6

-land is pushed up after sediment or mass is relieved off the land - glacial melt off of the lang

Question 7

What is tectonic sea-level change

Answer 7

• large change to the crust (sea bed)
• depressions - the weight of the volcanic islands causes the sea level to lower
• uplifts - the creation of islands - displacement of water - sea level rise

Question 8

What is stage 1 of the flow of sea level change

Answer 8

• Eustatic Fall
• climate calls
• more snow+ice
• more water stored
• hydrocycle slows
• sea levels fall
• whole planet eustatic fall
• GLACIAL TIME PERIOD

Question 9

What is stage 2 of the flow of sea level change

Answer 9

• Isostatic readjustment
• More ice sheets - glacial land sinks
• Affects some coastlines - not all
• Isostatic moderates eustatic fall

Question 10

What is stage 3 of the flow of sea level change

Answer 10

• eustatic rise
• climate heats
• ice melts
• sea levels rise
• INTERGLACIAL TIME PERIOD

Question 11

What is stage 4 of the flow of sea level change

Answer 11

• Isostatic readjustment
• Less ice sheets
• land rises as sea level rise (locally)
• Isostatic readjustment
• Moderates eustatic rise