lecture 6

Question 1

what is meant by the term “fluvial”?

Answer 1

found in river

Question 2

what are the 4 types of particle movement in rivers, explained?

Answer 2

traction- dragging of large particles
saltation- bouncing of smaller particles
suspension- the flow of particles smaller than sand
solution- small minerals/salts which have dissolved

Question 3

what is alluvium?

Answer 3

soil deposited by running water

Question 4

what is a floodplain?

Answer 4

parts of a river valley which contains alluvium which has been left by floods

Question 5

what are some causes of floods?

Answer 5

climate change (increase of rainfall)
sea level increase
land changed by construction

Question 6

2 things to think about before construction on floodplains

Answer 6

risk of flood (flood maps)
control measures (flood defence)

Question 7

what is enroachment?

Answer 7

the change of river flow

Question 8

what s a till?

Answer 8

soil deposited by glaciers

Question 9

what is a glacier?

Answer 9

compacted ice/snow that moves slowly downhill

Question 10

2 processes of glacier till

Answer 10

plucking: the ice freezes of the rock until it breaks
abrasion: rock is scraped against the ground

Question 11

what is lodgement till?

Answer 11

till that has been consolidated by over riding glacier

Question 12

what is ablation till?

Answer 12

deposited with glacier melts

Question 13

what is glaciofluvial deposits?

Answer 13

outwash sand and gravel

Question 14

what is glaciolacustrine deposits?

Answer 14

deposits in lake that have been created by meltwater from glaciers

Question 15

what is meant by periglacial?

Answer 15

not directly affected by glaciers but influenced by low temperature