 Chemical weathering involving rainwater and some minerals in rocks (feldspar + ferromagnesian)  React with feldspar and mica to form clay that crumbles.

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Presentation transcript:

 Chemical weathering involving rainwater and some minerals in rocks (feldspar + ferromagnesian)  React with feldspar and mica to form clay that crumbles easily and washed away  Clay are soft and expands in volume; causing granular disintegration  Iron in mica oxidised to form reddish-brown iron oxide  Resistant minerals like quartz are left unaltered and remain as sand  Reason why sedimentary rocks are formed by quartz and clay  Common in hot, wet regions

Spherodial weathering

 Swelling of rock minerals when they absorb water  Swelling causes stress in rocks, forcing grains apart  Anhydrous calcium sulphate absorbs water to form hydrated calcium sulphate (gypsum)  Repeated wetting and drying of minerals led to flaking of rocks; granular disintegration  Reversible change as mineral composition remains unchanged

Source: Interactive Geography Sec 3 textbook