2.8

Question 1

How can Erratics be used to reconstruct past glaciation?

Answer 1

Boulders are dumped by glacial errosionin places they would normally be found. The rock type can tell us where the glacier originated and analysising the distribution provides data about patterns of ice flow.

Question 2

How can moraines be used to reconstruct pas glaciation?

Answer 2

-Terminal moraines show the furthest extent of a glaciers snout

Question 3

How do drumlins show past glaciation?

Answer 3

The stoss end points up glacier and the lee end down glacier

The elogation index indicattes the speed of the ice movement (longer drumlin faster ice movement)

Question 4

How can till help to reconstruct past glaciation?

Answer 4

Till analysis of clast orientation can indicate the direction of ice movement. Analysis of till geology can also indicate provenance.

Question 5

How can crag and tail be used to reconstruct past galcial movement?

Answer 5

The stoss end points up the glacier and the lee down glacier

Question 6

How can roche mountonnees help reconstruct past glaciation?

Answer 6

Abrasion at the up end and plucking causing jaggered rock at the down end

Question 7

How can striations help reconstruct past glaciation?

Answer 7

The striations made in rock are parallel to ice movement