Rock Quiz (2011-2012) NSS1 Geography (Stream 1) 8-6-2012.

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Presentation transcript:

Rock Quiz ( ) NSS1 Geography (Stream 1)

Try your best! (Single / Pair-up) Observation & Discussion (2 min.) Memo writing (2 min.)

Items- personal information (a) Rock Sample (b) Rock appearance (c) Mineral / chemical composition (d) Rock characteristics (e) Type of rock (f) Other characteristics

Rock Sample 1

Answer: Rock sample 1 Rock appearance: coarse rounded pebbles and fine sand particles mixed together, fine groundmass (c) Mineral / chemical composition: clastic, sand grains (d) Rock characteristics: poorly-sorted under turbulent condition, hard / quite resistant, rock particles had been travelling for a long distance (e) Type of rock: sedimentary, conglomerate (f) Other characteristics: sign of chemical weathering / oxidation

Rock Sample 2

Answer: Rock sample 2 Rock appearance: dark grey in colour, fine crystals (c) Mineral / chemical composition: low silica content / basic rock (d) Rock characteristics: rapid cooling of lava, solidified on earth surface (e) Type of rock: igneous, basalt (f) Other characteristics: fresh rock / little modified by chemical weathering