Sea Level Change

Question 1

Eustatic change

Answer 1

A global change in sea level due to thermal expansion

Question 2

Isostatic change

Answer 2

Local changes in sea level resulting from land rising or falling relative to the sw

Question 3

How much lower we’re sea levels in the last glacial period

Answer 3

110 metres below current levels

Question 4

Four stage typical sequence of sea level rise

Answer 4

1.climate gets colder, water is stored as snow and ice, eustatic sea level fall
2.weight of ice land subsides, movement is isostatic
3.climate warms, ice melts, replenishes sea levels causes submerging features e.g rias and fjords
4.isostatic readjustment emergent features e,g raised beaches

Question 5

submergent features

Answer 5

Rias - flooded river valleys and floodplains
Fjords - flooded glacial valleys
Dalmatian coasts- rugged islands running parallel to the coast

Question 6

Emergent features

Answer 6

Raised beaches - Isostatic recovery
Marine platforms

Question 7

Predicted sea level rise between 1990-2090

Answer 7

18-59 cm