Causes Of Isostatic Change

Question 1

What causes isostaic chnage (3)

Answer 1

Tectonic activity
Glaciation
Post-glacial readjustment

Question 2

Tectonic activity what (2+)

Answer 2

Land can move up or down
Large scale change = fossils in Andes, alps and Himalayas show rocks in fold mountains previously on ocean floor

Question 3

Specific exmaple of isostaic chnage due to tectonics (2)

Answer 3

Tohoku earthquake in Japan in 2011
Some sections of coastline fell 0.84metres

Question 4

Cause = glaciation what (2+)

Answer 4

During an ice age = ice sheets and glaciers form over land
Causes land to be pressed into upper layer of the mantle = sea levels rise

Question 5

Causes = post glacial readjustment (3+)

Answer 5

Following on from melting of glaciers and ice sheets
Land is able to rise back up as the aesthenosphere rebounds = Isostatic recovery
Responsible for falling sea levels in Scotland