Geomorphology - Geography Objective Questions with Answers | Page-12

Answer: Option [B]

The hypothesis of Plate-tectonics assumes that the earth is composed of 20 lithospheric plates.

Answer: Option [C]

‘Weathering’ is the break-up of rocks exposed at the surface. Weathering describes the breaking down or dissolving of rocks and minerals on the surface of the Earth. Water, ice, acids, salts, plants, animals, and changes in temperature are all agents of weathering.

Answer: Option [B]

The stream which gets divided into a network of channels forming bars of send and bland is known as Braided stream. A braided river, or braided channel, consists of a network of river channels separated by small, often temporary, islands called braid bars or, in English usage, aits or eyots.

Answer: Option [A]

The correct answer is Lava ejection. There are many different types of volcanic eruptions and associated activity: phreatic eruptions (steam-generated eruptions), explosive eruption of high-silica lava (e.g., rhyolite), effusive eruption of low-silica lava (e.g., basalt), pyroclastic flows, lahars (debris flow) and carbon dioxide emission.

Answer: Option [C]

Granite is a typical example of Igneous rocks. Granite is a common, coarse-grained, hard igneous rock consisting chiefly of quartz, orthoclase or microcline, and mica. Granite has been used as a building material since ancient times.