isostatic processes

Question 1

landfroms

Answer 1

knickpoints and river terraces

Question 2

example

Answer 2

both found on river barrow near saint Mullins, co.kilkenny

Question 3

what does isosatci process involved

Answer 3

changes in sea level due tot he uplift or sinking of the earths lithosphere

Question 4

what is this caused by

Answer 4

removal or addition of huge ice sheets on the land during the ice ages

Question 5

what happens when the great weight of ice pressing down on the lithosphere during an ice age cause

Answer 5

to sink slightly under the weight

Question 6

what can this cause

Answer 6

local rise in sea level affecting only the area of land that is sinking under the weight

Question 7

what happens once the ice has melted

Answer 7

the weight of great ice sheets on the land is removed

Question 8

what happens to the lithosphere

Answer 8

slowly returns to its original level and the land is uplifted out of the sea

Question 9

what is the uplift of land called

Answer 9

isostasy

Question 10

what is the effect of isoctaco press on the Irish landscape

Answer 10

to change the base level of ant rivers flowing over the land

Question 11

what happens if the land is uplifted

Answer 11

then e rivers base level is lowered and it has renews ability to erode

Question 12

what is this known as

Answer 12

rejuvenrnation

Question 13

what are knickpoints

Answer 13

rapids and small waterfalls found in the mature or lower stage of a rivers course

Question 14

what happened due to the isostatic uplift

Answer 14

the sea level was lowered and the river had to travel over a longer course to reach the sea

Question 15

what happened to the river

Answer 15

rejuvenated or made young again as it was given renewed ability to cut down into the land (vertical erosion) in order to reach the sea

Question 16

what does the rejuvenated river do

Answer 16

cuts a new profile for itself and the place where the new profile meets the old profile is mean as knickpoint

Question 17

what happens when a river is rejuvenated

Answer 17

it begins to cut down into its existing floodplain and makes a deeper, narrower channel for itself

Question 18

what does this rejuvenated river make

Answer 18

new flood plain for itself at a lower level

Question 19

what happens to the original valley floor

Answer 19

is left high above the new flood plain and Is seen as ste[s in the land o either she of the rejuvenated river channel

Question 20

what are these steps called

Answer 20

river terraces

Question 21

diagram