S&P Index Funds. You can also buy an S&P 500 index fund, a pool of all the stocks in the index. The managers of index funds don't actively pick stocks but simply attempt to match the contents of the S&P 500 list.Many fund management companies, including Vanguard and Fidelity, list available S&P 500 index funds.PX is the stock market symbol for the S&P 500 stock index. ... How to Buy S&P 500 Stock. The S&P 500...
Chemical weathering-process by which the internal structure of a mineral is altered by the addition or removal of elements. Change in phase (mineral type) and composition are due to the action of chemical agents.Chemical weathering is dependent on available surface for reaction temperature and presence of chemically active fluids.nder these conditions, there is a tendency for all ordered systems to seek lower levels of energy or order. This is all done through weathering. Weathering-the disintegration and decomposition of rock at or near the surface of the earth. It affects the rocks in place and no transport is involved.
How Fast Does Weathering Occur? Type of Rock Minerals that make up the rock determine how fast it weathers Rocks made of slow dissolving minerals will weather slowly Rocks made of fast dissolving minerals will weather quickly Some rocks weather more easily because they are permeable Climate Refers to the average weather conditions in one area Both chemical & mechanical weathering occur faster in wet climates. Chemical reactions occur faster at higher temperatures. Chemical weathering occurs faster in hot & wet climates Rainfall provides water needed for chemical weathering Definition of Permeable Characteristic of a material that contains connected air spaces or pores that water can seep through easily Spaces increase surface area of the rock Water seeps through, carrying chemicals that dissolve the rock Water also removes material broken down by weathering