iGCSE Geography Edexcel

This subject is broken down into 36 topics in 10 modules:

  1. Coastal Fieldwork 10 topics
  2. River Environments 3 topics
  3. Coastal Environments 3 topics
  4. Hazardous Environments 3 topics
  5. Economic Activitiy and Energy 3 topics
  6. Rural Environments 3 topics
  7. Urban Environments 3 topics
  8. Fragile Environments and Climate Change 2 topics
  9. Globalisation and Migration 3 topics
  10. Development and Human Welfare 3 topics
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  • 10
    modules
  • 36
    topics
  • 13,017
    words of revision content
  • 1+
    hours of audio lessons

This page was last modified on 28 September 2024.

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Geography

River Environments

The Hydrological Cycle

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The Hydrological Cycle

The Hydrological Cycle

Overview

  • The hydrological cycle describes how water moves around the Earth, from the atmosphere to the Earth and back again.
  • This cycle is also known as the water cycle.
  • It includes a series of stages: evaporation, transpiration, condensation, precipitation, overland flow, throughflow and groundwater flow.

Evaporation

  • Evaporation is when the sun heats up water on the surface of rivers, lakes, or oceans, turning it into vapour that rises into the atmosphere.
  • Evaporation is a major method through which water enters the atmosphere.

Transpiration

  • Transpiration is another way water enters the atmosphere; this is when water is absorbed by plants and then released through small pores called stomata.
  • Together, evaporation and transpiration are sometimes referred to as evapotranspiration.

Condensation

  • Condensation is the process through which water vapour in the atmosphere cools down and forms liquid water droplets, which cluster together to create clouds.
  • Condensation is a vital stage - without it, water could not return to the Earth's surface.

Precipitation

  • Precipitation refers to any form of water - solid or liquid - that falls from the atmosphere to the Earth's surface. This includes rain, snow, sleet, and hail.
  • Precipitation occurs when condensed water droplets in clouds become too heavy and fall to the ground.
  • The amount and type of precipitation that occurs is greatly influenced by the local weather and climate conditions.

Overland Flow

  • The overland flow (or surface runoff) happens when water from precipitation flows over the Earth's surface. This happens when the land is unable to absorb the water quickly enough due to its being saturated or having an impermeable layer.
  • Overland flow is a significant contribution to river flow, and it can lead to soil erosion if not managed properly.

Throughflow

  • Throughflow is when water travels downwards through the underlying soil layers towards the riverbeds.
  • This water movement is influenced by the soil structure, vegetation, and slope steepness.

Groundwater Flow

  • Groundwater flow takes place when water infiltrates deeper and fills up the spaces and cracks in permeable rock formations, creating water-bearing rocks known as aquifers.
  • This water can slowly move towards lakes, oceans, and rivers or can be brought up to the surface through natural springs.

Course material for Geography, module River Environments, topic The Hydrological Cycle

Geography

Hazardous Environments

Management of Hazardous Environments

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Management of Hazardous Environments

Identifying Hazards

  • Key to managing hazardous environments is the ability to identify potential hazards. These might be natural, like earthquakes, or man-made, like industrial accidents.

  • Understanding the risk factors associated with different types of hazards helps inform hazard prevention strategies and disaster planning.

Monitoring and Prediction

  • Monitoring is essential for predicting when and where hazardous events might occur. This could involve seismic monitoring for earthquakes, or meteorological data for weather-related events.

  • With accurate prediction, warnings can be issued to populations at risk, allowing them to evacuate or prepare for the event, potentially saving lives and reducing damage.

Planning and Design

  • Town and country planning can help reduce the risk from hazardous events. This might include being mindful of flood plains when approving construction projects, or building earthquake-resistant structures in seismic zones.

  • Landscape design, such as forest management for fire mitigation, is another aspect of planning to reduce the impact of hazards.

Legislation and Policy

  • Government policies can play an important role in managing hazards. Examples include land-use policies, environmental regulations, and building codes.

  • International agreements can also be influential, particularly for global issues like climate change.

Education and Awareness

  • Raising public awareness about hazards and how to respond to them is a critical part of hazard management.

  • This might include education campaigns about fire safety, earthquake drills in schools, or flood evacuation routes in at-risk communities.

Response and Recovery

  • Even with effective management, hazardous events can still occur. Emergency response is therefore crucial in the immediate aftermath of a hazardous event to save lives and reduce damage.

  • In the longer-term, recovery strategies will aim to rebuild communities and restore affected areas, learning from the event to avoid similar impacts in the future.

Sustainability and Adaptation

  • Adapting to living with hazards can sometimes be more effective than attempting to completely prevent them.

  • For example, sustainable agriculture practices can help manage risks from droughts and floods, while certain coastal communities might adapt to regular flooding rather than trying to prevent it.

  • Ultimately, successful management of hazardous environments requires a balance of prevention, preparation, response, recovery, and adaptation.

Course material for Geography, module Hazardous Environments, topic Management of Hazardous Environments

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