World Geography Mixed Practice — MCQs with Answers (Set 12)

Anthracite coal has the highest carbon content of any major coal type, along with very few impurities. It burns cleanly and efficiently, producing minimal smoke compared to lower-grade coals. Lignite, by contrast, is the lowest grade, with the highest moisture content and the least stored energy per unit of weight.

Minerals form over millions of years through specific geological processes, making them non-renewable on any practical human timescale. Their formation depends on particular geological conditions, so they’re distributed very unevenly across the globe. Some regions hold rich mineral deposits, while others have virtually none, shaping global patterns of mining and trade.

Ranching involves raising livestock, especially cattle and sheep, across large, often semi-arid grazing lands. It’s practised extensively in regions like the American Great Plains, the Pampas of Argentina, and parts of Australia. Unlike nomadic herding, ranching is a commercially organised system, generally aimed at large-scale meat and wool production for wider markets.

Nomadic herders move their livestock periodically between different grazing areas, often following seasonal patterns. This practice is primarily aimed at meeting the herding community’s own subsistence needs, not large-scale commercial production. It remains common today across parts of Africa, Central Asia and the Middle East.

Terrace farming transforms steep, otherwise unusable hillsides into a series of flat, cultivable steps. This method significantly reduces water runoff and soil erosion, since each terrace slows down water flow. It has been used for centuries in mountainous regions worldwide, from the Andes to the Himalayas and the Philippines.

Zero tillage lets farmers plant seeds directly into undisturbed soil, often straight through leftover crop residue. It significantly reduces soil erosion, since the soil structure stays largely intact between plantings. It also helps retain more organic carbon in the soil, making it an increasingly popular sustainable farming method.

Borlaug won the Nobel Peace Prize in 1970, not a science-specific category, since agriculture has no dedicated Nobel Prize. His high-yield wheat varieties dramatically boosted food production across the world. This work is widely credited with saving hundreds of millions of people from famine, particularly in India and other developing nations.

Unlike deciduous forests, where trees drop their leaves together during a specific season, evergreen forest trees shed and regrow their leaves gradually and continuously throughout the year. This gives evergreen forests their consistently green appearance across all seasons. This pattern typically reflects a climate with reliably abundant rainfall spread throughout the year, rather than a sharply defined dry season.

The O-horizon sits at the very top of a soil profile, made up largely of organic material. This layer plays a major role in a soil’s overall fertility. The deeper B-horizon, by contrast, is mainly where minerals accumulate after being washed down from higher layers.

Cloudbursts occur when moisture-laden clouds release rain suddenly and with unusual intensity, typically over a very localised area. This intense concentration of rainfall can trigger flash floods and landslides, especially in hilly terrain. They’re particularly common in mountainous regions during the monsoon season.

The relatively calm centre is the eye. It is also the region of lowest surface pressure in a developed tropical cyclone.

The surrounding eyewall contains the strongest surface winds. A temporary lull under the eye does not mean the cyclone has ended.

Not every cyclone has a clear eye. A vortex describes rotating flow generally; core and funnel are not this named feature.

Review the eye–eyewall distinction. Continue with oceanography and regional geography for the ocean setting.

Jet streams form high in the atmosphere, typically near the boundary between the troposphere and stratosphere. Sharp temperature differences between neighbouring air masses drive these fast-moving currents. They can reach speeds exceeding 300 kilometres per hour, and significantly influence both weather patterns and long-distance air travel times.

Water seeps into small rock cracks and expands when it freezes, gradually widening these cracks over repeated cycles. This process is especially active where temperatures regularly swing above and below freezing. Cold, high-altitude and polar regions provide exactly these repeated freeze-thaw conditions.

The Tibetan Plateau covers a vast area in Central Asia, bordered by the Himalayas to its south. Its average elevation makes it the highest and largest plateau on Earth. Its formation is closely tied to the ongoing collision between the Indian and Eurasian tectonic plates.

Molten iron and nickel move within Earth’s liquid outer core, generating electric currents. These currents create Earth’s magnetic field, through a process called the geodynamo effect. This magnetic field protects Earth’s surface from much of the Sun’s harmful radiation and charged particles.

The Tropic of Cancer marks the northern edge of the zone where the Sun can be directly overhead. This happens at the June solstice, around 21 June. Its counterpart in the south is the Tropic of Capricorn. The tilt of the Earth’s axis sets the line at about 23.5 degrees.

The photosphere is the Sun’s outermost visible layer, with a temperature of roughly 6,000°C. The much hotter corona lies further out still, but it’s only visible from Earth during a total solar eclipse. Solar energy itself is generated deep within the Sun’s core, through nuclear fusion.