1.1.8

Question 1

Why have sea levels changed

Answer 1

• melting ice caps ‘
  -thermal expansion

Question 2

Wat are eustatic sea level changes

Answer 2

• changes to the absolute sea level. The total volume of water and the total change in where and how water is stored

Question 3

what happeneds to the sea levels if an increase int eh volume of freah water flowing into ocean.

Answer 3

• increases the sea level as the salinity is lowered and casues sea levels to rise

Question 4

What are glacio -eustatic changes

Answer 4

• Changes which occur due to the melting ice caps and the rise in the sea level as it releases water back into the sea

Question 5

what is hydro-isostacy

Answer 5

Hydro-isostasy is the vertical movement of the Earth’s crust caused by the loading or unloading of water. As the ice caps melt the weight of the water compresses the earth crust diminishing the sea level rise

Question 6

what are isostatic sea level changes

Answer 6

• Are changes to the regional sea levels

Question 7

What can upset the isostatic balance

Answer 7

• the melting of ice caps increasing the weight of the water therfore putting more weight on the plates.

Question 8

What will happned to counter act the isostatic inbalence

Answer 8

• Parts of the asthenosphere will float away , cuasing and isostatic depression and the land level to fall

Question 9

What happends in an isostatic depression

Answer 9

• The land level will fall. But this is compensated with a lanf ldevel rise in another area

Question 10

What is it called when th eland directly below the load begins to rise.

Answer 10

• isostatic readjustment or rebound

Question 11

What is a glacio-Isostatic subsidence

Answer 11

• Occoured in when the crust was depressed by ice sheets. During glacial periods ocean water volumes and global sea levels are very low. The glacial continents are regionally depressed by the weight of the glaciers so there relative sea level is higher than continents that did not experience glaciers.

Question 12

What is the proses called for the removal or melting of glaciers

Answer 12

• Deglaciation

Question 13

Name the sea level change that effets the whole world

Answer 13

• Eustatic

Question 14

Name the sea level change that has regional impacts

Answer 14

• Isostatic

Question 15

What is Glacio-isostasy

Answer 15

Vertical movement of the land

Caused by ice loading

Ice sheets press the land down

When ice melts → land rebounds

Question 16

what is Hydro-isostasy

Answer 16

Caused by water loading

Rising sea levels add weight to ocean basins

Ocean crust subsides slightly

Can cause nearby land to uplift

Question 17

What is a raised beach

Answer 17

A raised beach is a former shoreline left above present sea level due to relative sea-level fall, often caused by isostatic uplift.

Question 18

What does a contor line map show

Answer 18

• Areas of equal hight

Question 19

What does an isoline map show you

Answer 19

• A point of equal value (temperature, pressure, etc)

Question 20

key term for the fall of sea level

Answer 20

• marine regression

Question 21

What is the key word for rise in sea level

Answer 21

• Marine transgression

Question 22

Name a landform of eustatic sea level change

Answer 22

• Ria

Question 23

Landform of marine regression

Answer 23

-Raised beach