GEO 131 Chapter Notes - Chapter 6A: Geograph Britain And Ireland, Malaria, Supercontinent
Document Summary
1/5 of earth"s la(cid:374)d, as (cid:271)ig as chi(cid:374)a, i(cid:374)dia, us, me(cid:454)i(cid:272)o, a(cid:374)d europe combined. Cluster of great lakes: resulting from tectonic forces (except lake victoria) in rift valleys huge parallel fractures or faults, result in great, steep-sided, linear valleys. Plateau continent: almost entirely over 1000 ft. in elevation, half over 2500 ft. in elevation, has 6 major basins that have sunk. Africa was central in gondwana (southern part) Plate tectonics separation of pangaea, continents acquired present shapes: afri(cid:272)a"s histori(cid:272)al geograph(cid:455) Salt from desert peoples traded for ivory, spices, dried fruits from rainforest peoples: timbuktu (in present-day mali) was leading urban center, now in extreme isolation. Many people groups united into one nation. Flourished until attacked by muslims, then broke. Eastward shift into smaller parts: culture hearth in west africa, eastward movement after destruction of ancient ghana, possibly the result of growing islamic influence. Beyond the west: stable and durable kingdoms on northeast coast.
