geomorphology & earth landforms section 3 MCQ Questions & Answers Detailed Explanation

Answer: (a)

Answer: (c)

Igneous rocks are formed deep inside Earth’s crust (intrusive rocks) or at the surface (extrusive rocks).

As molten rock (known as magma) below the surface cools, the liquid material begins to solidify into minerals of differing sizes and compositions.

Generally, the longer the cooling time, the larger the mineral crystals can grow. Trapped deep in the Earth, magma is allowed to cool slowly. Examples of intrusive rocks are granite and gabbro.

Answer: (a)

Earth radius is the distance from Earth’s center to its surface, about 6,371 kilometers (3,959 mi).

Answer: (c)

A study of nature of the old sedimentary rocks gives an indication about its past environmental condition.

Answer: (d)

Mercalli scale

1. The intensity of an earthquake is measured by the Modified Mercalli Scale.
2. It measures the energy released during the earthquake. 
3. It is named after Mercalli, an Italian seismologist.
4. The intensity scale takes into account the visible damage caused by the event.
5. The range of intensity scale is from 1 to 12.

Answer: (a)

The world’s most active volcano is Kilauea. Increasing volcanic activity has been observed at one of the world’s most active volcanoes, Kilauea Volcano in Hawaii Island, after a new vent sent lava shooting 65 feet in the air.