Practice Climate and Climate Change: Earth Science Unit 7.
This unit covers climate zones, greenhouse effect, global warming and ice ages — essential concepts for Earth Science. Use our interactive study games to test your understanding, or review questions in traditional format below.
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This unit covers climate zones, greenhouse effect, global warming and ice ages — essential concepts for Earth Science. Use our interactive study games to test your understanding, or review questions in traditional format below.
Key Concepts Breakdown
1 Climate Zones
Climate zones are regions defined by long-term patterns of temperature and precipitation, primarily determined by latitude. Students must know the three main zones (tropical, temperate, polar) and the factors that modify them. Understanding how latitude, altitude, ocean currents, and proximity to water affect climate is essential.
Key Points
- Tropical zone (0°–23.5°): hot year-round, high precipitation; temperate zone (23.5°–66.5°): seasonal variation; polar zone (66.5°–90°): cold year-round
- Altitude lowers temperature at ~6.5°C per 1,000 m gain (environmental lapse rate)
- Ocean currents moderate coastal climates — warm currents raise temperatures, cold currents lower them and reduce precipitation
- Rain shadow effect: windward side of mountains receives heavy rain; leeward side is dry
A city at 45°N latitude sits on the leeward side of a mountain range. Predict its climate zone and whether it will be wetter or drier than a city at the same latitude on the windward side.
At 45°N the city falls in the temperate zone, so it experiences four seasons. Because it is on the leeward (downwind) side of the mountains, air has already dropped its moisture on the windward slope, making the leeward city significantly drier — this is the rain shadow effect. The windward city at the same latitude would receive far more annual precipitation.
2 Greenhouse Effect
The greenhouse effect is the process by which certain atmospheric gases absorb and re-emit infrared radiation, warming Earth's surface. Students must distinguish between the natural greenhouse effect (necessary for life) and the enhanced greenhouse effect (caused by human activity). Knowing which gases are greenhouse gases and why Earth's average temperature is ~15°C instead of –18°C is commonly tested.
Key Points
- Greenhouse gases (GHGs): water vapor (H₂O), carbon dioxide (CO₂), methane (CH₄), nitrous oxide (N₂O), ozone (O₃)
- Solar shortwave radiation passes through the atmosphere; Earth re-emits longwave (infrared) radiation that GHGs absorb
- Without any greenhouse effect, Earth's average surface temperature would be approximately –18°C
- More GHGs in the atmosphere trap more outgoing infrared radiation, raising surface temperatures (enhanced greenhouse effect)
Earth absorbs solar energy and radiates it back as infrared radiation. Explain why adding more CO₂ to the atmosphere causes surface temperatures to rise.
CO₂ molecules absorb outgoing infrared radiation that would otherwise escape to space. They then re-emit that energy in all directions, including back toward Earth's surface. With more CO₂ present, a greater fraction of outgoing radiation is trapped, so the surface must warm until a new energy balance is reached.
3 Global Warming
Global warming refers to the long-term rise in Earth's average surface temperature, primarily driven since the industrial era by increased atmospheric CO₂ from burning fossil fuels. Students must know the evidence for global warming, its causes, and its consequences. Distinguishing between global warming (temperature increase) and climate change (broader shifts in all climate variables) is frequently tested.
Key Points
- CO₂ concentration has risen from ~280 ppm (pre-industrial) to over 420 ppm today, closely correlated with temperature increase
- Evidence includes rising average temperatures, retreating glaciers, rising sea levels, and shifting species ranges
- Positive feedback loops amplify warming: melting Arctic ice reduces albedo; permafrost thaw releases CH₄
- Consequences: more frequent extreme weather, sea level rise (thermal expansion + ice melt), ocean acidification from dissolved CO₂
Arctic sea ice melts as global temperatures rise. Explain how this creates a positive feedback loop that causes further warming.
Sea ice is white and reflects about 80–90% of incoming solar radiation (high albedo). When it melts, it exposes dark ocean water, which absorbs about 94% of solar radiation instead of reflecting it. This absorbed energy warms the ocean further, melting more ice — a cycle that amplifies the original warming rather than counteracting it, making it a positive feedback loop.
4 Ice Ages
Ice ages are periods of long-term reduction in Earth's temperature during which continental ice sheets and glaciers expand significantly. Students must know the Milankovitch cycles as the primary natural driver of ice age cycles, and be able to explain the three orbital variations. The last glacial maximum was approximately 20,000 years ago.
Key Points
- Milankovitch cycles: eccentricity (~100,000 yr cycle), axial tilt/obliquity (~41,000 yr), precession (~26,000 yr)
- Ice cores provide evidence of past ice ages through trapped air bubbles showing CO₂ and temperature proxies (δ¹⁸O ratios)
- During glacial periods, sea levels drop as water is locked in ice sheets; during interglacials, sea levels rise
- Earth is currently in an interglacial period (Holocene) within a larger ice age (Quaternary Ice Age)
Ice core data from Antarctica shows CO₂ levels and temperature rising and falling together over the past 400,000 years in roughly 100,000-year cycles. Which Milankovitch cycle most closely matches this pattern, and what does it describe?
The ~100,000-year cycle matches Earth's eccentricity cycle, which describes how the shape of Earth's orbit around the Sun changes from nearly circular to more elliptical and back. When the orbit is more elliptical, the variation in solar energy received throughout the year is greater, influencing global temperatures. The correlation between CO₂ and temperature in ice cores supports the idea that orbital forcing triggers climate feedbacks that amplify temperature changes.
Questions, answered.
What is Climate and Climate Change?
Climate and Climate Change is Unit 7 of Earth Science, covering climate zones, greenhouse effect, global warming and ice ages.
How to study for Earth Science Unit 7?
Start with the Quick Summary above, review the Key Concepts, then test yourself with our interactive study games. Aim for 80%+ accuracy before moving on.
How many questions are in this unit?
This unit has 30+ review questions across 5 different game modes.