Solution:
Igneous rock has formed the Earth's crust. Most of the Earth's Crust is formed of Sial and Sima i.e. (Silica, Aluminium and Silica Magnesium) composition. Both of thes rock types are granitic in nature being of igneous formation (origin).
30. The formation of "Mushroom Rocks" in deserts is an example of which of the following?
Solution:
Mushroom rocks are those rocks which are eroded from base due to the action of wind. This process of undercutting produces rocks of mushroom shape. This phenomenon is very common in deserts as aeolian erosion is a dominant phenomenon in these regions.
Solution:
Gneiss is a foliated metamorphic rock that is a common distribute type of rock high-grade regional metamorphic approaches from pre-current formations that have been initially both igneous or sedimentary rocks. It has a glorious banding which is apparent on microscopic scale and hand specimen. Gneiss usually is prominent from schist by its foliation and schistosity; displays a properly-advanced foliation and a poorly advanced schistosity and cleavage.
32. ________ is the wearing away of the landscape by different agents like water, wind and ice.
Solution:
Erosion is the wearing away of landscape by different agents like wind, water and ice. Geologically erosion is the mechanical process of wearing or grinding of landscape by agents like water, wind and Ice.
33. The denudational processes have not reduced the land masses to a level because ________
Solution:
The denudational processes have not reduced the land masses to a level because the earth movements have uplifted the landmass. Denudation is an erosive process of breaking and removing the rocks from the surface of the earth. It is the wearing away of the terrestrial land by weathering, erosion, moving water, ice waves. Denudation is the result of two main processes, Endogenous and exogenous.
34. How are the caves of the world's greatest fold mountains formed?
Solution:
The caves of the world's greatest fold mountains are formed by compressional movement. Fold mountains are mountains formed from the folding of the earth's crust. Fold mountains are formed when two plates move together (a compressional plate margin).
35. The breaking up of the rocks at its place is known as
Solution:
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.
