Answer to Question 1
The high temperatures and abundant rainfall in a tropical rainforest cause intense chemical weathering that leaches most of the nutrients from the soil, leaving behind a residue of iron and aluminum oxides and hydroxides. The abundance of vegetation does mean, however, that there is a thick accumulation of organic matter to form an A horizon over a very infertile B horizon. The lush vegetation survives off of nutrients in the thick O horizon.
Answer to Question 2
Plants and plant matter generate organic acids which aid in dissolution of minerals in the A and E horizons. The liberated ions are flushed to deeper layers (B), leading to precipitation.
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