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  • THE ROCKS OF THE EARTH
    PHYSICAL GEOGRAPHY

    THE ROCKS OF THE EARTH

    The earth’s crust consists of rocks. A rock is any mineral material of the earth. It may be a combination of different mineral elements such as silica which contains silicon and oxygen. All the rocks differ from one another in texture, structure, colour, permeability, mode of occurrence and degree of resistance to denudation.   TYPES OF ROCK All rocks are classified into three major types: igneous rocks, sedimentary rocks, metamorphic rocks based on their origin (mode of formation) and appearance.   Igneous Rocks Characteristics Igneous rocks are crystalline in structure i.e. they contain crystals. They do not occur in layers i.e. they are non-stratified rocks. They do not contain fossils.…

  • GEOGRAPHY THEORY QUESTIONS AND ANSWERS ON ROCKS (PART 1)
    PHYSICAL GEOGRAPHY

    TEST QUESTIONS AND ANSWERS ON ROCK (PART 1)

    Define the term sedimentary rock and describe any two processes of its formation Sedimentary rocks are rocks formed from sediments deposited either by water, wind or ice. These sediments are formed in layers or strata, one on top of the other.  And after a long period of time, they become hardened by compression to form sedimentary rocks. Two processes of sedimentary rock formation are: Mechanical process: This involves the formation of sedimentary rocks from sediments accumulated from other rocks such as igneous and metamorphic rocks. These rocks settled in layers to form sedimentary rock e.g. Formation of sandstone, shale, etc. Chemical process: Pre-existing igneous and metamorphic rocks are precipitated chemically…

  • THINGS YOU SHOULD KNOW ABOUT ROCKS
    PHYSICAL GEOGRAPHY

    THINGS YOU SHOULD KNOW ABOUT ROCKS

    Earth’s crust is composed of rocks. Rock is a naturally occurring and coherent aggregate of one or more minerals. To geologists, a rock is a natural substance composed of solid crystals of different minerals that have been fused together into a solid lump. A Rock, by a simple definition, is a solid with more than one component of a mineral or mineraloid. A single crystal is not a rock; but two crystals that are joined together, even if they are the same mineral, are technically a rock. The minerals or mineraloids may be large enough to be easily identified (such as in a pegmatitic granite), barely distinctive grains (as in…

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