GEOL 1303 Lecture Notes - Lecture 5: Pyroxene, Spheroidal Weathering, Aluminium Hydroxide
Document Summary
Weatheri(cid:374)g is the ge(cid:374)eral pro(cid:272)ess (cid:271)(cid:455) (cid:449)hi(cid:272)h ro(cid:272)ks are (cid:271)roke(cid:374) do(cid:449)(cid:374) at earth"s surfa(cid:272)e. Weathering produces all the clays of the world, all soils, and the dissolved substances carried by rivers to the ocean, as well as particles transported in suspension. Chemical weathering occurs when the minerals in a rock are chemically altered or dissolved. The blurring or disappearance of lettering on old gravestones and monuments is caused mainly by chemical weathering. Physical weathering takes place when solid rock is fragmented by mechanical processes that do not change its chemical composition. Erosion is the set of processes that loosen and transport soil and rock downhill or do(cid:449)(cid:374)(cid:449)i(cid:374)d. these pro(cid:272)esses (cid:272)arr(cid:455) a(cid:449)a(cid:455) (cid:449)eathered (cid:373)aterial o(cid:374) earth"s surfa(cid:272)e a(cid:374)d deposit it elsewhere. As erosion moves weathered solid material, it exposes fresh, unaltered rock to weathering. B. weatheri(cid:374)g a(cid:374)d erosio(cid:374), alo(cid:374)g (cid:449)ith te(cid:272)to(cid:374)i(cid:272)s a(cid:374)d (cid:448)ol(cid:272)a(cid:374)is(cid:373), shape the earth"s surfa(cid:272)e a(cid:374)d alter rock materials, converting igneous and other rocks into sediment and soil.
