3.b. Submergent coastal landscapes form as sea level rises.

Question 1

Climate changes that occurred during a previous time period and the resultant sea level RISE

Answer 1

Warming climate (interglacial period) =

ice melts -> and water is released into the sea -> causing eustatic rise (globally)

land ice melts -> meaning the weight on land is reduced -> causing the land to rise (isostatic rebound) -> causing isostatic rise + fall on opposite side of land mass (relative change locally)

Question 2

the influence of rising sea levels due to a warming climate and the geomorphic processes shaping
landforms in submergent landscapes
- rias

Answer 2

a drowned river valley
-> as a result of a rise in sea level

gentle sloping sides

Question 3

the influence of rising sea levels due to a warming climate and the geomorphic processes shaping
landforms in submergent landscapes
- fjords

Answer 3

a drowned glacial valley
-> as a result of a rise in sea level

steep sides

Question 4

the influence of rising sea levels due to a warming climate and the geomorphic processes shaping
landforms in submergent landscapes
- shingle beaches

Answer 4

depositional landform made up of larger sediment between 1-2cm to 5-7cm

when sea level drops -> new land is exposed -> in low energy environments -> sediment is deposited and accumulates

when sea levels rise -> waves push sediment onto shore -> creating shingle beaches

Question 5

the modification of these landforms by processes associated with present climate and sea level changes

Answer 5

• erosion- current sea levels are causing wave action to erode sides of valley of fjord and land where ria is- where this erosion occurs will depend on where present-day sea level reaches
• weathering- current day weathering processes can lead to mass movement = can lead to a reduction in steepness of valley sides of fjords

Question 6

the modification of these landforms by processes associated with future climate and sea level changes

Answer 6

• sea levels predicted to rise by 0.6m within next 100 years -> marine erosion of rias and fjords likely to increase due to larger waves and more storms
• shingle beaches- more sediment may be transported and removed -> shrinking these beaches over time (e.g. Chesil beach has been modified by LSD as sea levels have rose)