Unit 2B - Rivers, Coasts & Flooding

A river starts very small before getting larger. What is the name given to a small river that joins a larger river?

• Confluence

• Tributaries

• Source

• Main Channel

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

• Upper

• Middle

• Slower

What are the three processes that occur as a river flows from its source to the mouth?

• Attrition, Abrasion, Solution & Hydraulic Action

• Upper, Middle & Lower

• Erosion, Transportation and Deposition

• Traction, Suspension, Saltation & Solution

Where does deposition mostly occur?

• Upper Course

• Middle Course

• Lower Course

During Waterfall Formation, which process wears away the banks and bed of the river and causes the soft rock to undercut the hard rock?

• Erosion

• Transportation

• Deposition

Name the process:  The wearing away of rock by bashing & crashing into other rocks

• Abrasion

• Suspension

• Attrition

• Saltation

Give reasons for the differences in cross sections of rivers in the upper and lower courses

• In the upper course rivers are narrow and swallow because the river is less powerful and discharge relatively low. In the lower course the river is wider and deeper as the river carries more load, discharges more and has more power to erode.

• In the upper course rivers are wide and deep because the river is less powerful and discharge relatively low. In the lower course the river is narrow and shallow as the river carries more load, discharges more and has less power to erode. 

• As a river moves from its upper to its lower course, it tends to carry more load, is wider, deeper, faster flowing and discharge increases

A meandering river winds over the landscape as seen in the picture. The meandering river erodes on the outside of the meander and deposits it on the inside of the meander because water flows slower on the outside of the meander?

• True

• False

When moving water from a river empties into a standing body of water like the ocean, the sediments fall out of suspension and are deposited. Why do the sediments fall out of suspension?

• The water loses energy and slows down

• Water gains energy and moves faster

• Ocean water is colder

• Ocean water is warmer

What Effects the Size and Energy of Waves?

• Windspeed

• Gradient

• Presence of Vegetation

• Fetch