Mercury arc Sentence Examples

What do retro and retrograde have in common? They both refer to moving backward: Retro refers to moving to a past time, and retrograde means moving in a backward direction.

Both can also describe some pretty odd phenomena, whether it’s those retro fashions that keep creeping back up or a person’s peculiar behavior during Mercury retrograde.

The three basic types of rocks are igneous, metamorphic and sedimentary. Sedimentary rocks make up most of the rocks on the earth and are formed when bits of rock, soil or organic matter settles and accumulates. Plant and animal fossils can be found in sedimentary rock. When there is an abundance of plants and animals, fossil fuels develop, like oil, natural gas and coal. Types of sedimentary rocks include carbonate rocks, chemically precipitated rocks, clastic rocks and coal.