Natural Causes of Climate Change (OCR GCSE Geography B (Geography for Enquiring Minds)): Quizzes
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10 questions from this quiz
What are the three main natural mechanisms that have driven climate change over geological time?
What are the three main natural mechanisms that have driven climate change over geological time?
Milankovitch cycles, sun spots, volcanoes
How long does the eccentricity cycle take to complete?
How long does the eccentricity cycle take to complete?
Approximately 100,000 years
What happens when Earth's orbit is more elliptical?
What happens when Earth's orbit is more elliptical?
Earth moves closer to Sun & receives more heat
How long does the precession (axial wobble) cycle take?
How long does the precession (axial wobble) cycle take?
Approximately 23,000 years
Between what angles does Earth's axial tilt (obliquity) vary?
Between what angles does Earth's axial tilt (obliquity) vary?
Between 21.5° and 24.5°
What happens when Earth has a greater axial tilt (closer to 24.5°)?
What happens when Earth has a greater axial tilt (closer to 24.5°)?
Warmer global temps & more extreme seasons
What do sun spots actually indicate about the Sun's energy output?
What do sun spots actually indicate about the Sun's energy output?
Increased solar activity & more energy output
How long is the sun spot activity cycle?
How long is the sun spot activity cycle?
11 years
What is the timescale of volcanic eruptions' effect on climate?
What is the timescale of volcanic eruptions' effect on climate?
Short-term cooling lasting several years
By how much did Mount Pinatubo's 1991 eruption drop global temperatures?
By how much did Mount Pinatubo's 1991 eruption drop global temperatures?
Approximately 0.5°C