1 / 7

Chemical Weathering: Hydrolysis & Hydration

Chemical Weathering: Hydrolysis & Hydration. Hydrolysis. 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

zorina
Download Presentation

Chemical Weathering: Hydrolysis & Hydration

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript


  1. Chemical Weathering: Hydrolysis & Hydration

  2. Hydrolysis 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

  3. Spherodial weathering

  4. Hydration 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

  5. Pressure release

  6. Pressure release Source: Interactive Geography Sec 3 textbook

  7. Tower Karst

More Related