Quick Review Flashcards - Click to flip and test your knowledge!
Question
What is the general geographical process of wearing away landmass through weathering, erosion, mass movement, and transportation?
Answer
Denudation
Question
Define the process of 'Weathering' in the context of denudation.
Answer
The disintegration of rocks by atmospheric agents at or near the earth's surface without displacement.
Question
How does 'Erosion' differ from 'Weathering' regarding the movement of rock material?
Answer
Erosion involves the displacement and transportation of rock waste to another place, whereas weathering does not.
Question
What is 'Mass Movement' or 'Mass Wasting'?
Answer
The large-scale movement of loose materials down a slope due to the force of gravity.
Question
In geography, what process refers to the movement of material loosened by erosion to another location by wind or water?
Answer
Transportation
Question
What is 'Deposition' in the context of denudation?
Answer
The laying down of weathered and eroded material by natural processes such as water, wind, and ice.
Question
Name the four active agents of denudation mentioned in the text.
Answer
Water, wind, waves, and glacial ice.
Question
List three factors that determine the force of erosion, transportation, and deposition of a river.
Answer
The gradient of its course, the volume of water it carries, and the load of sediments.
Question
How does the velocity of water affect the processes of erosion and transportation?
Answer
Erosion and transportation are both maximum when water velocity is high.
Question
Under what condition does a river primarily begin to deposit its material?
Answer
When the velocity of the water is low.
Question
How does the volume of water in a river correlate with its power of erosion?
Answer
A larger volume of water results in a greater power of erosion and transportation.
Question
Define a river's 'Load'.
Answer
The material, such as rock waste and sediments, being transported by a river.
Question
What is the 'Source' of a river?
Answer
The place where a river originates, typically in mountains from glaciers or lakes.
Question
What term is used for the place where a river enters the sea or disappears before reaching it?
Answer
Mouth
Question
What is a 'Tributary'?
Answer
A stream or small river that joins a larger main river.
Question
What are 'Distributaries'?
Answer
Channels or smaller rivers formed when a main river divides, typically near its mouth.
Question
The path along which a river flows from its source to its mouth is known as its _____.
Answer
Course
Question
Identify the three main sections that constitute the profile of a river.
Answer
Upper Course, Middle Course, and Lower Course.
Question
Which stage of a river's life cycle corresponds to the Upper Course?
Answer
The Young Stage
Question
What is the dominant activity of a river in its Upper Course?
Answer
Erosion
Question
Describe the typical characteristics of a V-shaped valley.
Answer
A narrow valley with steep slopes formed by a stream eroding downward through vertical corrosion.
Question
In what specific environment do rivers develop I-shaped valleys or gorges?
Answer
Regions consisting of hard or resistant rocks.
Question
How is a 'Waterfall' defined?
Answer
A vertical fall of an enormous volume of water from a great height in the long profile of a river.
Question
What feature is formed at the base of a waterfall by the impact of falling water on soft rock?
Answer
Plunge pool
Question
What are 'Rapids'?
Answer
Step-like features in a river bed formed due to differences in the rate of erosion.
Question
Which stage of a river's life cycle corresponds to the Middle Course?
Answer
The Maturity Stage
Question
In the Middle Course, which type of erosion is more active than down cutting?
Answer
Lateral cutting
Question
Define a 'Meander'.
Answer
An S-shaped bend or pronounced loop in the longitudinal course of a river.
Question
What landform is created when a river breaks through the neck of a sharp meander loop?
Answer
Oxbow lake
Question
Which stage of a river's life cycle corresponds to the Lower Course?
Answer
The Old Stage
Question
What is the dominant work of a river in its Lower Course?
Answer
Deposition
Question
Why is the load-transporting capacity of a river drastically reduced in its Lower Course?
Answer
The flow of water becomes sluggish due to the very gentle gradient.
Question
What is a 'Delta'?
Answer
A triangular-shaped landform at the mouth of a river formed by the deposition of sediments over a large area.
Question
Which Greek letter does a river delta resemble?
Answer
The Greek letter $\Delta$ (Delta).
Question
List three essential conditions for the formation of a river delta.
Answer
A nearly calm sheltered sea, a large sediment supply, and a reasonable river size.
Question
What is the primary environment where wind serves as the most effective agent of denudation?
Answer
Arid regions or deserts with little vegetation and moisture.
Question
Describe the formation of 'Deflation Hollows'.
Answer
They are depressions created when wind lifts and blows away loose surface materials like sand and pebbles.
Question
Give an example of a massive deflation hollow located in the Sahara Desert.
Answer
The Qattara Depression
Question
What are 'Sand Dunes'?
Answer
Hills of sand formed and moved by the action of winds in deserts.
Question
Identify the two types of sand dunes typically found in tropical deserts.
Answer
Barchans and Longitudinal Dunes (or Seifs).
Question
Describe the shape and movement of a 'Barchan'.
Answer
It is a moon-shaped dune that advances steadily in the direction of the wind.
Question
What are the slope characteristics of the windward and leeward sides of a Barchan?
Answer
The windward side is convex and gently-sloping, while the leeward side is concave and steep.
Question
What are the 'horns' of a Barchan?
Answer
The pointed ends of the dune that thin out and become lower in the direction of the wind.
Question
What are 'Seifs' or 'Longitudinal Dunes'?
Answer
Long, narrow sand-ridges that grow parallel to the direction of the prevailing wind.
Question
What does the word 'Seif' mean in Arabic?
Answer
Sword
Question
How can the migration of sand dunes be checked or halted?
Answer
By the growth of vegetation (trees and grasses) on the wind-ward slope.
Question
Define the term 'Gradient' in geography.
Answer
The degree of inclination of a sloping surface.
Question
What is an 'Estuary'?
Answer
The tidal mouth of a river where fresh water from the river and saline water from the sea are mixed.
Question
What happens to the level of land as a result of long-term denudation?
Answer
The level of land is lowered, rock surfaces are rounded, and peaks are levelled.
Question
Why is wind erosion more pronounced in desert regions than in humid regions?
Answer
Deserts lack vegetation and moisture to bind loose surface materials together.
Question
Under what condition does lateral cutting by a river become more active than downward vertical cutting?
Answer
During the Middle Course or Maturity Stage.
Question
What landforms are characteristic of a river's Upper Course besides V-shaped valleys?
Answer
Gorges, rapids, and waterfalls.
Question
What type of landform is produced when a river divides into many mini-distributaries near its mouth?
Answer
A delta
Question
How does the 'Load' of a river influence the formation of landforms?
Answer
The deepening of valleys and the specific shapes of landforms depend on the type and amount of load the river carries.
Question
What is the relationship between river velocity and the process of deposition?
Answer
Deposition occurs when the velocity of water is low.
Question
In which stage does a river's energy become just enough to drag large particles along its bed?
Answer
The Middle Course (Maturity Stage).
Question
Name one of the highest and best-known waterfalls in the world mentioned in the text.
Answer
Angel Falls in Venezuela (986 m).
Question
What happens to the curvature of meanders over time as a river continues its lateral erosion?
Answer
The loops become more circular and sharp until the river eventually breaks through the neck.
Question
Where are 'Seifs' primarily found in a desert landscape?
Answer
In the interior parts of deserts.
Question
Why are migratory sand dunes considered dangerous?
Answer
They can migrate with the wind and damage towns, villages, or agricultural land.