Sedimentary Rocks

Osmtann Science

Origins of Sedimentary Rocks

Over time, rocks erode and smaller pieces form. The pieces are carried by wind and settle somewhere else.

3 Main Types

CLASTIC• Smaller sediments cemented togetherCHEMICAL • Chemical reactions form new productORGANIC• Dead organic material bound together.

CLASTICCOARSE GRAINED …FINE GRAINED

CLASTIC

CLASTICSANDSTONE: Used in buildings

CLASTIC

SANDSTONE DOORWAY

CLASTIC

SANDSTONE CASTLE

CHEMICALSALT: HALITEfrom the evaporation of ocean or saline lake waters.

CHEMICALHEMATITE: IRON ORE. Iron and Oxygen combine in solution and deposit as a sediment.

CHEMICAL

A piece of a banded iron formation, a type of rock that consists of alternating layers with iron(III) oxide (red) and iron(II) oxide (grey). BIFs were mostly formed during the Precambrian, when the atmosphere wasn't yet rich in oxygen. Moories Group, Barberton Greenstone Belt, South Africa.

IRON

CHEMICAL: Iron Ore

This stockpile of iron ore pellets will be used in steel production.

CHEMICAL: Iron Ore

IRON ORE IS USED TO MAKE STEEL

STEEL CABLES PICTURED TO THE LEFT

ORGANICOcean animals called coral create huge deposits of limestone As they die, their skeletons collect on the ocean floor.

ORGANIC

ORGANICCoal is an organic sedimentary rock that forms mainly from plant debris. The plant debris usually accumulates in a swamp environment. Coal is combustible and is often mined for use as a fuel.