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Many are fossil crusts, in the sense that they relate to past climatic, biologic, and
geomorphic environments and are not forming under present conditions in these
areas. Other types of crust are associated with sub- humid to arid climates, ...
There is only the roughest of tendencies for duricrust chemistry to be controlled
by bedrock chemistry, even in similar climates, although nephelinesyenites
characteristically weather into allitic (aluminum- rich) crusts, basic igneous rocks
Conifers are characterized by their needle-shaped leaves; they survive well in
harsh climates and where soil conditions are relatively poor. Most conifer forests
are found in the Northern Hemisphere, the largest concentration occurring in a ...
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