1 the set of exogenic (physical, chemical and biological) processes that alter the physical and chemical state of rocks at or near the earth's surface.  intensity of most weathering decreases with depth, because variations in temperature and moistures decrease with depth.
A gene is a segment of nucleic acid that contains the information necessary to produce a functional product, usually a protein. Genes consist of a long strand of DNA (RNA in some viruses) that contains a promoter, which controls the activity of a gene, and a coding sequence, which determines what the gene produces.
A gene is a segment of DNA that codes for a polypeptide or for a molecule of RNA, such as a transfer RNA (tRNA) or ribosomal RNA (rRNA). The genes in the nucleus are in chromosomes. A chromosome consists of a molecule of DNA (two after replication of the DNA) and associated proteins. Genes are segments of DNA molecules.