geomorphology & earth landforms section 9 Practice Questions Answers Test with Solutions & More Shortcuts

Answer: (d)

Answer: (d)

The Core is made up of heavier rocks having a density of 3 g/cm³. This type of rock found in the oceanic crust is basalt.

The mean density of material in the oceanic crust is 2.7 g/cm³.

The Mantle has a density higher than the crust’s (3.4 g/cm³).

The crust and the uppermost part of the mantle are called the lithosphere. Its thickness ranges from 10-200 km. The lower mantle extends beyond the asthenosphere. It is in a solid state.

The density of material at the mantle core boundary is around 5 g/cm³ and at the centre of the earth at 6,300 km, the density value is around 13g/cm³.

The core is made up of very heavy material mostly constituted by nickel and iron. It is sometimes referred to as the nife layer.

Answer: (b)

Alluvial fans are fan-shaped deposits of water transported material (alluvium). They typically form at the base of topographic features where there is a marked break in slope.

Consequently, alluvial fans tend to be coarse-grained, especially in their mouths. At their edges, however, they can be relatively fine-grained.

Answer: (b)

The Great Barrier Reef is in the Coral Sea, on Australia’s north-eastern coast. It stretches more than 2,300km along the state of Queensland’s coastline, beginning at the tip of Cape York Peninsula in the north and extending down to Bundaberg in the south. The Great Barrier Reef is ideal for Cairns Scuba Diving.

Answer: (a)

The Black Forest is an example of a block mountain. The Black Forest is a wooded mountain range in Baden-Wurttemberg, southwestern Germany. It is bordered by the Rhine valley to the west and south.

The highest peak is the Feldberg with an elevation of 1,493 metres (4,898 ft). The region is almost rectangular with a length of 160 km (99 mi) and a breadth of up to 60 km (37 mi).