Distribution of temperature and inversion of temperature

At the same latitude altitude can reduce temperature. In exams treat altitude as a key clue when latitude is same.

Closed warm isotherms can show a local thermal anomaly. In exams read closed patterns as heat centres.

Inversion can trap moisture and fog near the surface. In exams link valley fog with a stable lower layer.

Dark surface absorbs more energy and vegetation cools through transpiration. In exams check surface properties together.

Cold current cools but hot land wind can raise temperature. In exams balance opposing factors.

A clear winter night cools the surface and forms a stable lower layer. Link winter morning pollution with inversion in exams.

Direct answer: Option D, the thermal effect of ocean currents. Isotherms are lines joining places with equal temperature. Ocean currents transport warm or cold water and transfer heat to or from the air over nearby coastal areas. A warm current can make a coast warmer than places at the same latitude, while a cold current can make it cooler. This changes the expected temperature pattern and may bend or shift isotherms near the coast. Option D identifies the physical cause. Option A, language difference, has no direct effect on temperature distribution. Option B, river names, are labels and cannot explain thermal patterns. Option C, population difference, may influence local urban heat in limited areas, but it is not the main reason for the contrast between warm- and cold-current coasts. Exam cue: when coastal temperature differs unusually from latitude, check ocean currents.

Cold lower layer and warmer upper layer identify inversion. In exams read vertical temperature order by layers.

Land heats and cools quickly so annual range is large. In exams link inland areas with continentality.

Mountain altitude can lower temperature and form a cold centre. Link closed cold lines with altitude in exams.

Cold air pools below so middle slopes may be less affected by frost. Understand agricultural use of valley inversion in exams.

Clouds lower daytime maximum and raise nighttime minimum. In exams treat clouds as reducing temperature range.

A thick stable layer can further restrict vertical mixing. Link inversion thickness with pollution duration in exams.

Direct answer: Option B is the best answer. Temperature at a place depends on more than latitude. A cold ocean current cools nearby air; greater altitude generally lowers temperature; and a high-albedo surface reflects more incoming solar energy, so less energy is absorbed. The reasoning is: cold current gives a cooling influence, height makes air cooler, and high albedo reduces heating. Together these factors explain why a place can be cooler than its latitude alone suggests. Option A is less suitable because a warm current, low albedo and urbanisation generally add heat or reduce cooling, although local details can vary. Option B correctly combines three cooling factors. Option C is wrong because dry hot wind and a black surface generally increase heating. Option D is not the best explanation: a south-facing slope can receive more sunlight in many Northern Hemisphere situations, and a clear day often permits stronger solar heating, though slope effects depend on hemisphere and season. Exam cue: for unexpectedly low temperature, select the combination containing cold currents, high altitude and high reflectivity.

Warm current low albedo and urban surface can raise temperature. Identify local warming factors in exams.

Altitude lowers mean temperature and distance from sea increases range. Separate mean and range in exams.

Moisture can condense over a cold stable surface and form fog. Link dew point and inversion with fog in exams.

Rain can settle particles and weaker inversion can increase mixing. In exams note that weather change can reduce pollution trapping.

Large difference between day and night temperature raises daily range. Link dry plateau with high diurnal range in exams.

Warm current can raise coastal temperature and change isotherm pattern. Understand line deflection by currents in exams.

Thermal equator shows the zone of maximum temperature and can shift seasonally. Treat it separate from geographic equator in exams.

More concrete and less vegetation increase heat storage. After major factors are same check local surface features in exams.

Inversion acts like a stable lid and stops mixing of surface air. Distinguish upper wind and surface air in exams.

Low latitude can reduce annual difference and dryness can increase daily difference. Understand both ranges separately in exams.

Dark rock has low albedo and absorbs more energy. Link surface change with temperature in exams.