geomorphology & earth landforms section 10 Practice Questions Answers Test with Solutions & More Shortcuts

Answer: (a)

An isthmus is a narrow strip of land connecting two larger land areas, usually with water on either side.

The Panama Canal crosses the Isthmus of Panama, connecting the North Atlantic and Pacific Oceans; the Suez Canal connects the Mediterranean Sea and the Indian Ocean, cutting across the western side of an isthmus formed by the Sinai Peninsula. Strait is the sea counterpart of the isthmus.

Answer: (b)

Answer: (a)

Extensive deserts occur in the western tropical regions of continents because of the effect of both the offshore easterly trade winds and cold ocean currents. Most deserts arise due to atmospheric wind conditions.

Other deserts result from the effects of ocean currents on landmasses, where cool air masses carry fog and mist, but little rain, along coastal regions. The world desert map depicts the location of all the deserts of the world.

They are centred along the Tropics of Cancer and Capricorn. The heart of the tropical desert climate is found near the tropics of Cancer and Capricorn, usually toward the western side of the continents.

Answer: (b)

The Earth is composed predominantly of a large mass of igneous rock with a very thin veneer of weathered material—namely, sedimentary rock. Igneous rocks are formed from the solidification of magma, which is a hot molten or partially molten rock.

Igneous and metamorphic rocks make up 90–95% of the top 16 km of the Earth’s crust by volume.

Answer: (b)