ROCKS AND WEATHERING

Rocks

composed of minerals natural occurring and have a chemical

formula○ ex. quartz is SiO2

rock cycleprocesses where rock changes from one form to

another○ igneous, sedimentary, and metamorphic

igneous- molten rock cools and solidifies

sedimentary- sediments are compacted and converted to rock by the process of lithification.

metamorphic- existing rocks changed by heat and pressure

Weathering and Erosion - breaking rocks apart

Physical (mechanical) weatheringglaciers moving, water (ice) expanding, wind, and

plant rootserosion: wind and water can loosen and move

sedimentdeposition: the sediment then builds up

somewhere else Chemical weathering

O, H2O, and CO2 chemically react with many minerals forming new compounds