Chapter 1: Rocks and mineral extraction

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28 Terms

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Igneous rocks

Rocks that are formed by the solidification of molten magma or lava.

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Intrusive ignenous rock

Magma cools beneath the surface

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Extrusive igneous rock

Magma comes out as lava and cools on the surface

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Give two examples of igneous rocks.

Granite and Obsidian

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Give two properties of igneous rocks.

  1. Contains crystals

  2. High density

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Sedimentary rock

Rocks that are formed from sediments

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Give two examples of sedimentary rock.

Limestone and Sandstone

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Give two properties of sedimentary rock.

  1. Soft and break apart easily

  2. May contain remains of living organisms

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Metamorphic rocks

Rocks that are formed from high pressures or temperatures

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Give two examples of metamorphic rocks.

Gneiss and Quartzite

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Weathering

The breaking down of minerals or dissolving of rocks in the Earth’s surface

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Erosion

The process of wearing away and moving of rocks, soil, or other materials on the Earth's surface by natural forces like wind, water, or ice.

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Mineral

A solid, hard natural substance

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Ore

A rock containing high amounts of minerals

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Give two methods of mining.

Subsurface and surface mining

<p>Subsurface and surface mining</p>
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Subsurface mining

Mining involves sinking a vertical shaft underground to the rocks containing minerals and building a horizontal tunnel down to the mineral layers and loose rock from the mines is transported to the surface where the minerals get transported away. This type of mining is used when the ore deposits are below the Earth’s surface.

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Surface mining

Mining that involves the removal of vegetation, and explosion of rocks, where the machines are used to remove loose rocks, and the rock being transported by trucks or railway wagons

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Give three types of surface mining.

  • Open pit mining

  • Quarrying

  • Strip mining

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Identify some uses of different rocks.

Sand → Makes glass

Chalk→ Manufacturing cement

Gravel → Makes concrete

Granite → Used for construction

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Identify an advantage of subsurface mining

Lesser pollution

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Identify the disadvantages of subsurface mining.

  • More expensive

  • More dangerous to miners

  • Tunnel collapses

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Identify an advantage of surface mining

Less expensive

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Identify the disadvantages of surface mining

  • Visual pollution

  • Noise pollution

  • Destruction of habitats

  • People have higher risks of getting infectious diseases

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Identify three ways of conserving the environment damaged by mining.

  • Landfilling

  • Landscaping

  • Reclamation

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Landfilling

The dumping of waste in an area.

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Identify the impacts of landfilling.

  • Cheap and easy way to dispose waste

  • Causes pollution

  • Affects nearby communities with polluted water and higher risks to diseases such as cholera

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Landscaping

Land is made to look like a natural landscape to make it look as if the land was not disturbed by mining

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Reclamation

The land can be reclaimed by from mining to be used for farming