sea level change

Question 1

why does sea level fall

Answer 1

• water is stored as ice on land

- land emerging

Question 2

why does sea level rise

Answer 2

• ice melts due to global warming
• thermal expansion
• subsidence of land

Question 3

what is eustatic sea level change

Answer 3

• global

- when ice melts, volume of water increase and sea level rise

Question 4

what is isostatic sea level change

Answer 4

• local
• as a result of the weight of ice
• when ice sheets cover land, causes sea level to rise as land is weighed down

Question 5

what is tectonic sea level change

Answer 5

• the spreading of the ocean floor through plate divergence.
• creates a eustatic fall in sea level
• changes as a change in size of ocean basin

Question 6

what is isostatic readjustment

Answer 6

when ice melts, the sea level falls because land rises

Question 7

what human factors cause sea level change

Answer 7

climate warms
steric effect
extraction of resources

Question 8

how does climate warms affect sea level change

Answer 8

ice melts meaning the volume of water increases

Question 9

how does steric effect affect sea level change

Answer 9

warming lowers the density of water, the upper layers of the ocean wamr and expand, increasing total volume

Question 10

how does extraction of resources affect sea level change

Answer 10

removing groundwater and fossil fuels from low lying areas

Question 11

what natural factors change sea level

Answer 11

climate cools
tectonic activity
glacial rebound

Question 12

how does climate cools affect sea level chnage

Answer 12

more water as ice means less in oceans

Question 13

how does tectonic activity affect sea level change

Answer 13

local tilting leads to submergance

Question 14

how does glacial rebound affect sea level change

Answer 14

gradual rise of land after an ice sheet that one weighed it down

Question 15

what are the 2 emergent landforms

Answer 15

marine terraces

raiased beaches

Question 16

what are marine terraces

Answer 16

-formly submerged land is exposed by uplift or lowering sea levels

Question 17

what are raised beaches

Answer 17

• areas of former wave cut platoforms and their beaches that are at a higher level than current sea level
• common in Scotland where 3 levels are noticed

Question 18

what are the 4 emergent landforms

Answer 18

fjord
dalmation coasts
ria
submerged forests

Question 19

what Is a fjord

Answer 19

• drowned glacial valley
• found in Canada
• steep valley sides are straight and narrow
• formed when sea drowned the lower part of a glacier valley

Question 20

what are dalmation coasts

Answer 20

• when the shape of the land runs parallel to the coast and floods by sea level rise
• coast of croatia

Question 21

what are ria’s

Answer 21

• created by rising sea level drowing a river valley

- Devon

Question 22

what are submerged forests

Answer 22

• climate warms and marsh and forests grew but end up drowned
• only tree stumps remain
• In Borth north wales

Question 23

why is sea level rising

Answer 23

• increased volume of the ocean = warming due to CC, water as ice melts
• subsidence of the coast

Question 24

impacts of sea level rise

Answer 24

• coastal flooding
• greater migration away from coasts
• increased cost for flood protection
• underwater ground resources has to be moved
• threat to coastal habitats