2023 NECO GCE Geography Obj & Practical Answers – Nov/Dec

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GEOGRAPHY OBJ
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51-60: BDBBCBBAAB

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NECO GCE GEOGRAPHY

Question Paper

NUMBER ONE

(3a)
Rocks are naturally occurring solid materials composed of minerals or mineral-like substances. They are formed through various geological processes such as cooling and solidification of molten materials (igneous rocks)rocks), or metamorphism of existing rocks (metamorphic rocks).

(3b)
(i) Mechanically Formed Sedimentary Rock: These sedimentary rocks are formed from the accumulation and consolidation of fragments of pre-existing rocks. The fragments, known as clasts, are transported by various agents such as water, wind, or ice, and then deposited in layers. Examples include sandstone, shale, and conglomerate.
(ii) Chemically Formed Sedimentary Rock: These sedimentary rocks are formed from the precipitation of minerals dissolved in water. When water evaporates or becomes oversaturated with dissolved minerals, these minerals can crystallize and form rocks. Examples of chemical rocks include limestone, dolomite, and rock salt.
(iii) Organically Formed Sedimentary Rock: These sedimentary rocks are formed from the accumulation and compaction of organic remains, such as plants or animal fossils. Over time, the organic matter undergoes chemical and physical changes, resulting in the formation of organic rocks. Examples of organic rocks include coal, oil shale, and chalk.

(3c)
(PICK ANY TWO)
(i) Rocks like granite, limestone, and sandstone are widely used as building and construction materials.
(ii) Rocks such as bauxite, which is the primary source of aluminum, and hematite is used in iron production and for manufacturing processes.
(iii) Rocks like phosphate rock and limestone are used as fertilizers to enrich soil fertility and improve crop yields.
(iv) Precious stones and gemstones, such as diamonds, rubies, and emeralds, are used in jewelry and decorative items, adding value and aesthetic appeal.
(v) Rocks like particularly coal and uranium-bearing rocks, are important sources of energy.

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