River processes and features

The _________ is an area of land that separates water flowing into different drainage basins.

• Watershed

• Source

• Confluence

• Tributary

The valley walls of a river are the steepest at which river course?

• Upper

• Middle

• Lower

Where does deposition mostly occur?

• Upper Course

• Middle Course

• Lower Course

Which river process is mostly responsible for the formation of deltas and floodplains?

• Erosion

• Transportation

• Deposition

Stream discharge is a function of the channel's width, depth, and 

• length
• velocity
• sediment size
• slope

What is carried downstream by a river?

• boulders

• rocks

• silt

• load

Attrition occurs when...

• particles of load collide and knock pieces off each other

• smaller material rubs against the bed and banks of the river

• acid in the water dissolves particles of rock from the bed and banks of the river

• the sheer force of the water and air forcing itself into the soil

A waterfall is created because of ...

• the types of layers of rock
• the force of gravity
• deforestation
• deposition

There are four main types of erosion for rivers. Which answer is correct.

• Hydraulic Action, Attrition, Rubbing, Silting
• Hydraulic Action, Abrasion, Deposition, Solution
• Hydraulic Action, Abrasion, Silting, Solution
• Hydraulic Action, Solution, Abrasion, Attrition

Explain the differences in the size and shape of the material on the river bed in the upper and lower courses of a river

• A. In the upper course load is smaller and more rounded than in the lower course because of erosional processes such as attrition and corrasion.
• B. As a river moves through its course, because of the greater incidence of larger settlements, more supermarket shopping trolleys are likely to be found in rivers, adding to the load that has already been deposited.
• C. In the lower course load is smaller and more rounded than in the upper course because of erosional processes such as attrition and corrasion.