| http://www.w3.org/ns/prov#value | - Investing in Tropical Trees: Understanding Tropical Soils: Part 1...... of eastern Colombia llanos orientales and Venezuela have soils that are mainly composed of sand , ferrous oxide gravels and some clay Similar conditions exist in large parts of Brazil and in the Amazon basin This is why Amazon deforestation is such a huge problem poor people cut down trees to grow subsistence crops , collect o
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