Page 35 - Year 7 Knowledge Organiser

Geography: Africa: 3 of 5 Geography: Rivers 4 of 5

Types of Erosion Types of Transportation
Hydraulic The sheer force of the river causing the bed and banks to Traction Large boulders are rolled along the river
Action erode. bed.
Key Terminology Abrasion Material carried by the river erodes by scraping along the Saltation Pebbles are bounced along the river
bed and banks. bed.
Population The number of people who live
density within 1km 2 Solution The water dissolves certain rocks. Suspension Sand and silt are held in the flow of the
water.
Population How many people are spread over Eroded material carried by the river, hits into each other Solution Mineral are dissolved in the water.
distribution an area. Attrition becoming smaller, smoother, and rounder. Deposition The dropping of material when a river
loses energy.
Corruption Dishonest behaviour by those in
power, typically involving dishonesty.

Ethnic group A community or population made Application: Boscastle floods 2004
up of people who share a common
cultural background or descent. Cause

Colony A country or area under the control 1. Very heavy rainfall, 89mm in just 1 hour.
of another country and occupied by 2. Steep slopes of Bodmin Moor caused surface run-off.
settlers from that country. 3. Impermeable ground meant precipitation could not
infiltrate.
Civil war A war between citizens of the Effect
same country.
1. 25 businesses ruined, costing £25 million in lost trade.
Stakeholder Someone with an interest or 2. Four bridges destroyed.
concern in an issue. 3. Homes damaged costing £500 million to repair.

Primary Impacts The initial impact of a natural event 4. 75 cars washed away.
on people and Response
property, caused directly by it.
1. Immediate - seven helicopters sent in to rescue people
Secondary The indirect impacts of an event, from the roofs of buildings.
Impacts usually occurring in the hours, 2. Long term – river widened and deepened.
weeks, months or years after the 3. Long term - bridges made wider.
event.