EQ3 2B.7

Question 1

What is eustatic change

Answer 1

Change in global sea level due to a change in the volume of water in the oceans as glaciers melt and thermal expansion of water occurs

falls - glacial periods
rises - end of glacial period

Question 2

What is isostatic change

Answer 2

Change in local land level

Fall in sea level - local land level rises due to post glacial adjustment/accretion
Rise in sea level - drop in local land level due to postglacial adjustment, subsidence, tectonics

Question 3

How do tectonics affect SLR

Answer 3

Eustatic - rising magma at constructive plate margin/hot spots lifts crust, reducing capacity of ocean, eustatic SLR

Isostatic - folding of sedimentary rock at destructive boundary produced isostatic fall in anticlines

FAULTING can uplift HORST blocks of crust producing isostatic rise in land & fall in local sea level

Question 4

Emergent coastline features

Answer 4

Raised beaches - beach that is now above high tide level again, usually vegetated by plant succession

Fossil cliffs - steep slope found at back of raised beach exhibiting evidence of formation through marine transgression, now above high tide

Raised stumps

Question 5

Submergent coastline features

Answer 5

Ria - drowned river valley (v shaped)
Fjord - drown glacial valley (U shaped)

Question 6

What is a dalmatian coast?

Answer 6

Long, narrow islands running parallel to the coastline and separated from the coast by narrow sea channels called sound

SLR floods coastline, sea overtops low points forming straits linking and separating sections of anticline ridge into narrow islands

Question 7

How does global warming act as a risk to some coastlines

Answer 7

Leads to eustatic SLR

Question 8

How does tectonics act as a risk to some coastlines

Answer 8

Emission of geothermal heat from underwater volcanoes inc temp

Question 9

Prediction by IPCC of sea level rise

Answer 9

18-59 cm by 2100