Traditionally, the earth's surface has been modeled as a sphere, but the world geodetic system of 1984 (wgs-84) uses an ellipsoid as a more accurate model. it places the center of the earth at the origin and the north pole on the positive z-axis. the distance from the center to the poles is 6356.523 km and the distance to a point on the equator is 6378.137 km. (a) find an equation of the earth's surface as used by wgs-84.

Sedimentary rock formation occurs when igneous, metamorphic, or other sedimentary rocks are exposed to the unyielding forces of nature found on the earth's surface. the formation of sedimentary rock occurs by several processes over millions of years. when rock sediments are deposited, an increase in weight causes pressure to increase which leads to the compaction of the rock particles. water is pushed out and cementation occurs as dissolved minerals are deposited in the very small spaces between the rock sediments acting as glue that binds the sediments together. which process describes the changing of sediments into rock by compaction and cementation? a) deposition b) lithification c) physical weathering d) chemical weathering