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Geography-Obj
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2024-NECO-GEOGRAPHY-ANSWER!-By-ExamKey.Net
(1)
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(3ai)
Mode Of Formation: Igneous rocks are formed by the cooling and solidification of molten rocks called magma, ejected from beneath the earth's crust. The magma which results from high temperature and pressure beneath the earth, forces itself towards the earth's surface through cracks. As the magma moves towards the surface, it comes in contact with lower temperature, hence it cools and solidifies to form Igneous Rocks. A very good example of them are Basalt and Granite.
(3aii)
(i) They are either acidic or basic.
(ii) They are usually hard and impervious.
(iii) They do not contain fossils.
(iv) They do not occur in layers, i.e. they are non-stratified rocks.
(v) Igneous Rocks are crystalline in structures, i.e. they contain crystals.
(vi) They vary in Colour (light or dark).
(3b)
{CHOOSE ANY BEST 4}
(i) Igneous rocks like granite, basalt, and gabbro are used as building materials for their strength and durability.
(ii) Igneous rocks like marble, quartz, and obsidian are used for decorative purposes, such as countertops, flooring, and sculptures.
(iii) Igneous rocks like pumice and basalt are used as abrasives for cleaning and polishing surfaces.
(iv) Igneous rocks are used as aggregate in concrete, asphalt, and road construction.
(v) Igneous rocks like granite and basalt are used as dimension stone for architectural purposes.
(6ai)
River Capture: Also called river piracy or river beheading, refers to two parallel consequent