Lithosphere - Study Mode

[#81] Which of the following belts are associated with seismic activity? 1. Circum-Pacific Belt 2. Circum-Atlantic Belt 3. Mid-Continental Belt 4. Mid-Atlantic Belt
Correct Answer

(B) 1, 3 and 4

Explanation

Solution: The belts associated with seismic activity are Circum-Pacific Belt, Mid-Continental Belt and Mid-Atlantic Belt. Ring of Fire, also called Circum-Pacific Belt or Pacific Ring of Fire, long horseshoe-shaped seismically active belt of earthquake epicentres, volcanoes, and tectonic plate boundaries that fringes the Pacific basin. Mid-Continental Belt is a large volcanically active region. Other terms are used for smaller areas of activity, such as volcanic fields. Volcanic belts are found above zones of unusually high temperature (700-1400 °C) where magma is created by partial melting of solid material in the Earth's crust and upper mantle. These areas usually form along tectonic plate boundaries at depths of 10–50 km. The Mid-Atlantic Ridge (MAR) is a mid-ocean ridge, a divergent tectonic plate or constructive plate boundary located along the floor of the Atlantic Ocean, and part of the longest mountain range in the world.

[#82] Marble comes under which category of rocks?
Correct Answer

(C) Metamorphic

Explanation

Solution: Marble is a metamorphic rock that forms when limestone is subjected to the heat and pressure of metamorphism.

[#83] Which of the following are correctly matched? 1. Gneiss : Metamorphic 2. Granite : Igneous 3. Sandstone : Sedimentary
Correct Answer

(D) 1, 2 and 3

Explanation

Solution: All the three are correctly matched. Gneiss : Metamorphic. Gneiss is formed by high temperature and high-pressure metamorphic processes acting on formations composed of igneous or sedimentary rocks. Granite : Igneous. Granite is a light-colored igneous rock with grains large enough to be visible with the unaided eye. Sandstone : Sedimentary. Sandstone is a clastic sedimentary rock composed mainly of sand-sized mineral particles or rock fragments.

[#84] Which of the following is/are the examples of the sedimentary rocks? 1. Limestone 2. Dolomite 3. Breccia 4. Coal
Correct Answer

(C) 1, 2 and 4

Explanation

Solution: Limestone, Dolomite and Coal are the examples of the sedimentary rocks. Organic sedimentary rocks are formed from the accumulation of any animal or plant debris such as shells and bones. These plant and animal debris have calcium minerals in them that pile on the sea floor over time to form organic sedimentary rocks. Examples include rocks such as coal, some limestone, and some dolomites.

[#85] Arrange the following soil particle by size in the descending order: I. Gravel II. Clay III. Silt IV. Sand
Correct Answer

(C) I, IV, III, II

Explanation

Solution: Soil particle by size in the descending order are Gravel, Sand, Silt and Clay.