Year 7 Geography Comprehensive Revision Guide

Ordnance Survey Map Skills and Navigation

• The 8 Compass Directions: Students must know the 8 cardinal and ordinal points of the compass for orientation and navigation.

• Finding a 4-Figure Grid Reference:

  • Objective: To find the bottom-left corner (marked as X) of the specific square you want to identify.

  • Step 1: "Go along the corridor" to find the first number. Follow the corridor until you reach the number directly above or aligned with the red X. Example given: The number is $42$.

  • Step 2: "Go up the stairs" to find the second number. Move up until you reach the level of the red X and identify the number next to it. Example given: The number is $13$.

  • Final Output: Combine the numbers into a coordinate format. Example: $(42, 13)$.

• Finding a 6-Figure Grid Reference:

  • Step 1: Mentally or physically divide the identified square into a finer $10 \times 10$ grid.

  • Step 2: Go along the corridor past the large digit ($02$) to find the smaller sub-unit number ($8$). The first three figures are $028$.

  • Step 3: Go up the stairs past the large digit ($01$) to find the smaller sub-unit number ($4$). The next three figures are $014$.

  • Final Output: Combine all figures to create the precise grid reference. Example: $(028, 014)$.

• Describing the Steepness of Land (Relief):

  • Spot Height: Represented as a blue triangle on the map. This symbol often marks the peak height of the land and indicates the specific elevation in meters above sea level.

  • Contour Lines: These are brown lines drawn on a map to show elevation above sea level.

  • Interpreting Contours: If contour lines are packed close together, it indicates steeper land. If they are spread further apart, the land is flatter.

• Calculating Distance on a Map:

  • Scale Definition: The scale indicates the real-world distance between two points based on the map representation.

  • Standard OS Scale: A standard Ordnance Survey (OS) map scale is typically $1 : 50'000$.

  • Scale Conversion: At this scale, $1\,\text{cm}$ on the map is equivalent to $50'000\,\text{cm}$. This can be converted to $500\,\text{m}$ or $0.5\,\text{km}$.

  • Process for Finding Distance:

    1. Measure the map distance using a ruler or a piece of string in centimeters ($\text{cm}$).

    2. Multiply the measured centimeters by the scale. example: If a measurement is $3.5\,\text{cm}$, calculate $3.5 \times 50'000 = 175'000\,\text{cm}$.

    3. Simplify the result into meters by dividing by $100$. Example: $175'000\,\text{cm} \div 100 = 1'750\,\text{metres}$.

    4. Convert to kilometers if needed: $1.75\,\text{km}$.

Physical Geography: The Earth and Volcanoes

• Layers and Movement of the Earth:

  • Tectonic Plate: These are giant pieces of the Earth's crust that constitute the surface. They move constantly but very slowly.

  • Plate Boundary: The edge where two tectonic plates meet. These regions are the primary locations for volcanic activity and earthquakes.

  • Magma: This is molten rock (referred to as lava once it surfaces) located beneath the Earth's crust.

  • Convection Currents: Circular motions of magma within the mantle. Heat from the core causes magma to rise and then split in two directions when it hits the crust. The resulting friction between the moving magma and the crust causes the tectonic plates to drift. This movement is roughly as fast as the growth of a human fingernail.

• Types of Volcanoes:

  • Shield Volcano:

    • Location: Found on constructive plate boundaries where two plates move away from each other.

    • Characteristics: Features shallow sides and a wide base.

    • Eruption Style: Gently erupts with very runny, low-viscosity lava.

  • Composite Cone Volcano:

    • Location: Found on destructive plate boundaries where one plate crashes into another.

    • Characteristics: Steep-sided and narrow in shape.

    • Eruption Style: Highly explosive and dangerous eruptions.

    • Lava Type: Erupts with very sticky, thick (high viscosity) lava.

Global Development and Urban Challenges

• Understanding Development:

  • Definition: The process by which a country improves its wealth, health services, and education standards to enhance the overall quality of life for its citizens.

  • Human Development Index (HDI): A statistical ranking from $0$ to $1$ used to measure a country's level of development. A score of $1$ represents the highest possible level of development.

• Factors Inhibiting Development:

  • Harsh Climate: Extreme heat, cold, or aridity prevents the growth of crops for food or trade, trapping the population in poverty.

  • Legacy of Colonialism: Historical exploitation by colonizers (such as Britain and France) who stole resources, leaving the nation with minimal natural wealth.

  • Disease: Prevalent diseases like malaria and cholera require high healthcare funding and reduce the workforce as people are too sick to work.

  • Poor Education: A lack of literacy and numeracy skills prevents individuals from escaping poverty or obtaining higher-paying jobs.

  • Government Corruption: Officials may misappropriate funds for personal gain or warfare rather than investing in essential infrastructure like schools and roads.

• Challenges in Fast-Developing Cities (Case Study: Lagos, Nigeria):

  1. Unsafe Housing: Rapid growth leads to informal settlements (slums) with poor structural integrity. These houses often collapse during storms. These areas lack clean access to water and electricity, allowing disease to spread.

  2. Traffic and Pollution: Insufficient public transport (like trains) leads to extreme road congestion and increased air pollution, resulting in respiratory and lung problems.

  3. Education Deficits: In poorer urban areas, there are not enough schools for children, forcing them to enter the workforce at a very young age.

  4. High Crime Rates: Desperation due to a lack of basics (like water) leads to theft and the formation of gangs.

Energy Resources: Types, Pros, and Cons

• Energy Categories:

  • Non-renewable: Energy sources that nature cannot replenish within a human lifetime, specifically fossil fuels (coal, oil, gas) and nuclear energy.

  • Renewable: Energy sources that are replenished quickly by natural processes.

• Types of Renewable Energy:

  • Wind Power: Turbines spin in the wind to generate electricity.

  • Hydroelectric Power: A dam blocks a river to create a reservoir; releasing the water spins turbines for electricity.

  • Solar Power: Sunlight hits solar cells to create electricity.

  • Biomass: The process of burning plant or animal waste to produce energy.

  • Geothermal: Harnessing heat from volcanoes or the Earth's interior.

• General Perspectives on Renewables:

  • Advantages: They will not run out (infinite); building/maintaining them creates jobs; they do not release $CO_2$ (fighting climate change); they can lower future energy bills.

  • Disadvantages: High initial construction and maintenance costs; inconsistent performance in certain environments (e.g., solar power in dark/cloudy countries).

• Fossil Fuels (Coal, Oil, Gas):

  • Origin: Formed from plant and animal remains from millions of years ago.

  • Pros: Highly reliable and relatively cheap.

  • Cons: Burning them releases $CO_2$ into the atmosphere, which is the primary driver of climate change.

• Nuclear Energy:

  • Definition: Splitting uranium atoms to release energy.

  • Pros: Produces massive amounts of energy; does not release carbon dioxide.

  • Cons: Nuclear waste is difficult to dispose of (must be stored underground); the risk of a meltdown is catastrophic, as seen in Chernobyl, which can kill people and ruin land forever.

Exam Technique and Revision Strategies

• Command Words and How to Answer:

  1. Define: Provide the specific meaning of the word.

  2. Describe: State what is visible or occurring. Use data to prove points.

     • Example (Graph): "The graph is increasing. In 1981 the temperature was $13^\circ\text{C}$, but in 2025, it was $17^\circ\text{C}$."

     • Example (Volcano): "A shield volcano has shallow sides and erupts gently."

  3. Explain: Provide detailed information regarding actions and their subsequent effects.

     • Example: "One impact of volcanoes is death. After Mount Pinatubo erupted, over $800$ people died. This results in families losing members and survivors suffering lifelong injuries that prevent them from working."

  4. Assess: Explain multiple factors and provide your overall judgment. You must use specific place examples to reach the top marks.

     • Example: "Corruption stops development. South Sudan has a corrupt government that spends money on war instead of infrastructure. This is a very significant factor."

• Revision Methods:

  • AI generation: Input knowledge boxes into Copilot for multiple-choice questions.

  • Mindmapping: Use each knowledge box as a branch on a map.

  • Brain Dump: Write down everything remembered about energy, volcanoes, Earth layers, or development barriers.

  • Flashcards: Question on one side, answer on the other.

Geography Practice Questions

• General Knowledge Questions:

  1. Define the terms: magma, crust, tectonic plate, convection current ($4\,\text{marks}$).

  2. Describe two features of a composite cone volcano ($2\,\text{marks}$).

  3. How do convection currents move tectonic plates? ($3\,\text{marks}$).

  4. Explain 2 advantages of one type of renewable energy ($4\,\text{marks}$).

  5. Assess the different factors that can stop a country from developing ($6\,\text{marks}$).

  6. Assess the advantages and disadvantages of different types of energy ($6\,\text{marks}$).

• Map Skills Practice (Based on Ordnance Survey Map):

  1. Which place is furthest EAST: Purbeck Way or Ballard Point?

  2. Give the 4-figure grid reference for The Warren Wood.

  3. Give the 4-figure grid reference for Old Harry.

  4. Give the 6-figure grid reference for the viewpoint.

  5. Give the 6-figure grid reference for the middle of King Barrow.

  6. What type of woodland is found in $(05, 82)$?

  7. At Purbeck Way, is the land steep or flat?

  8. At Purbeck Way, the land is between ______ and $110\,\text{m}$ high.

  9. In $(04, 82)$, is the land steep or flat?

  10. Given a scale of $1\,\text{cm} = 1\,\text{km}$, if the distance between Old Harry and Parson's Barn is $1.5\,\text{cm}$, how many kilometers is this?