Desertification (AQA A-Level Geography): Quizzes
📚Quizzes
Practise the questions
10 questions from this quiz
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Practise the questions
10 questions from this quiz
What is desertification?
What is desertification?
Persistent degradation of dryland areas
How much lower were global temps at the last glacial maximum (18,000 years ago)?
How much lower were global temps at the last glacial maximum (18,000 years ago)?
Roughly 12°C lower than today
When was the Holocene Climate Optimum?
When was the Holocene Climate Optimum?
Approximately 8,000 years ago
Which region had the greatest rainfall loss globally in the last 25 yrs of the 20th century?
Which region had the greatest rainfall loss globally in the last 25 yrs of the 20th century?
The Sahel region
What happens to soil during overgrazing?
What happens to soil during overgrazing?
Soil becomes depleted of nutrients
What cycle creates a positive feedback loop in desertification?
What cycle creates a positive feedback loop in desertification?
Vegetation loss → Soil exposure → Erosion
What percentage of Earth's surface is currently desertified?
What percentage of Earth's surface is currently desertified?
Approximately 25%
How many people face desertification risk?
How many people face desertification risk?
About 1 billion people in 100 countries
With each doubling of CO₂, what temp increase could drylands experience?
With each doubling of CO₂, what temp increase could drylands experience?
Between 2°C and 5°C
How many hectares of land are lost to desertification annually?
How many hectares of land are lost to desertification annually?
Roughly 12 million hectares