Saturday, October 4, 2025

Answers to Friday 5: Oct. 3, Geog 12

 1.  What are two differences between the mouth and the source of a river?

source:  where the river begins, usually at elevation, from a glacier or spring or rain run off.  It is usually a steeper gradient and the river is less wide, more larger boulders etc...

mouth:  where the river ends and meets an ocean, another river or a lake.  Usually flow is slower and river is wider here.  Sometimes creates a delta or estuary here.  Lower elevation and more small rocks, not really large boulders.

2.  What are some things that characterize a young river?

Steeper, rapids, waterfalls and canyons, flow is pretty straight, less tributaries as drainage basin is less developed, V shaped, narrow valley, stream bed is lined with boulders, cobbles, rock 

3.  List two drainage patterns of a river (or sketch them).

dendritic, trellis, parallel, radial, deranged

4.  What are the four ways that a river erodes a landscape?

Erosion happens via Abrasion, Attrition, Hydraulic Action & Solution

Abrasion:  causes river bed to become deeper through the action of scraping or wearing away

Attrition:  stones and rocks knock together breaking into smaller particles so the bedload is breaking itself apart or by hitting the bed

Hydraulic Action:  the ability of moving water to dislodge and transport rock particles, breaking up the banks

Solution:  Water dissolved soluble materials


5.  List two ways that humans try to manage river flow?

Dams, reservoirs, levees, dykes, hydroelectric power stations, dredging

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