引起极大兴趣 发表于 2025-3-21 19:01:53
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North Atlantic Shield-Areas,n dispersed by continental drift in comparatively recent geological times. The continental fragments which form the bulk of these lands, when reassembled to make allowance for the effects of drift, form three great structural entities (Fig. 3.1):PACT 发表于 2025-3-22 07:05:53
Precambrian of Asiatic Laurasia,sion of topics of special interest which are considered in later pages. The continent of Asia as it now exists is composite; part is derived from Laurasia, part from Gondwanaland, the two portions being separated by the broad Himalayan mobile belt (Fig. 5.1).entice 发表于 2025-3-22 09:08:12
The Australian Craton, arcs to the north and east. The oldest and most extensive unit is the . which comprises most of the central and western parts of the continent where Precambrian rocks are exposed beneath an intermittent Phanerozoic cover.逃避现实 发表于 2025-3-22 14:39:26
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H. H. Read F.R.S, F.R.S.E, F.G.S., D.Sc., A.R.C.S.,Janet Watson Ph.D., A.R.C.S., D.I.C.the crop produce is eaten away or destroyed by pests and pathogens, and its one fourth is attributed to plant diseases. Among various groups of plant pathogens, phytonematodes cause 5–20% yield decline in food crops, which may account to a net loss of 2–7% in crop-based food. Rice, wheat, and maize