As a result of the Human Genome Project, a gene map of the entire human genome was produced. A gene map shows A.
the relative frequency of variations of genes within a population.
B.
the relative frequency of genes entering and leaving a population.
C.
the relative location of DNA within the nucleus of each cell.
D.
the relative location of each known gene on a chromosome.

igneous rocks which formed by the crystallization of magma at the surface of the earth called extrusive rocks. they are characterized by fine-grained textures because the rapid cooling at or near the surface did not provide enough time for large crystals to grow.

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water, ice, acids, salts, plants, animals, and changes in temperature are all agents of weathering. weathering is the breaking down or dissolving of rocks and minerals on earths surface. once a rock has been broken down, a process called erosion transports the bits of rock and minerals away.