Stream Patterns

Question 0

Dendritic: (4)

Answer 0

Large.
Undisturbed by underlying rock.
Irregular branching.
Highly integrated - reflects old age.

Question 1

Radical: (4)

Answer 1

Channels radiate from a single point.
Channels radiate from topographic high.
Looks like spokes of a wheel.
May be from a dome or volcanic cone.

Question 2

Rectangular: (3)

Answer 2

Hard rock.
On heavily eroded, fractured rock surfaces.
Sharp, right angled bends.

Question 3

Parallel: (4)

Answer 3

Young and simple.
Single rock type.
Uniform sloping.
Develop into dendritic systems over time.

Question 4

Deranged: (4)

Answer 4

Young system.
Follows local / random gradients.
Lack of adjustment to underlying rocks.
Common on deglaciated land.

Question 5

Annular: (4)

Answer 5

Hard and soft rock.
Erodible beds.
Flows into a dome.
Forms almost circular channels around the dome.

Question 6

Centripetal: (3)

Answer 6

Streams converge towards a central depression.
Lake in the centre.
Volcanic crator.

Question 7

Trellis: (2)

Answer 7

Alterations of hard and soft rock bands.

Long, parallel tributaries.