Describe three major environmental challenges facing Oceania.
Three major environmental challenges facing Oceania are climate change and rising sea levels, damage to marine ecosystems, and pollution and habitat loss. Rising seas threaten low-lying islands with flooding and saltwater intrusion. Warmer, more acidic oceans contribute to coral bleaching, while overfishing and pollution also harm reefs and other marine habitats. Development and resource use can destroy or fragment coastal and island ecosystems.
Describe the regions of New Zealand and explain why this country is known for geothermal power.
New Zealand is made up mainly of the North Island and the South Island. The North Island has rolling lowlands as well as active volcanic areas and geothermal features. The South Island is more mountainous, with the Southern Alps, glaciers, and fjords. New Zealand is known for geothermal power because it lies along an active plate boundary, where volcanic and tectonic activity heats underground water that can be used to generate electricity.
Of the three major Pacific Island groups, __________ was most recently settled.
Contrast the physical features of the high and low islands of the Pacific. Why would geographers separate the Pacific Islands into these two categories?
High islands are usually volcanic and rise steeply above the ocean, with mountains, valleys, and often fertile soils. Low islands are generally flat, low-lying coral islands or atolls formed from reefs, often surrounding a lagoon. Geographers separate them because their origins and physical features differ, which also affects their soils, resources, settlement, and vulnerability to rising sea levels.
At 12,316 feet, __________ is the highest peak in New Zealand.
In which of the following regions can you find the Australian outback, expansive deserts, and coastal farmlands?
Which region of Australia is most important for farming and sheep herding?
Describe the Great Barrier Reef. Why is this site considered one of the world's most important ecosystems?
The Great Barrier Reef is a vast system of coral reefs and islands off the northeastern coast of Australia. It is one of the world's most important ecosystems because it supports an extraordinary variety of marine life, including corals, fish, turtles, and other species. Its reefs provide habitat and nursery areas, support food webs, and help protect nearby coasts.
Compare and contrast the physical features of East and West Antarctica. How are the two halves of this continent different from one another?
East Antarctica is the larger and higher half of the continent. It has a broad, high plateau covered by a very thick ice sheet and is generally colder and more stable. West Antarctica is smaller and lower, with more rugged terrain and the Antarctic Peninsula. Much of its ice rests on bedrock below sea level, so it is more vulnerable to warming and ice loss.
Describe Antarctica's qualities and explain why this unique continent would attract scientific study.
Antarctica is the coldest, driest, and windiest continent, and it is also the highest on average. Nearly all of its land is covered by a massive ice sheet. Its extreme and relatively undisturbed environment attracts scientific study because researchers can examine ice cores for evidence of past climates, monitor changes in ice and sea levels, study the atmosphere and climate, and observe ecosystems and wildlife adapted to polar conditions.
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