Weathering

Describes the breaking down or dissolving of rocks and minerals on the surface of the earth

Weathering

TWO TYPES OF WEATHERING

• PHYSICAL OR MECHANICAL WEATHERING

• CHEMICAL WEATHERING

® It’s a type of weathering in which rocks are physically broken into smaller pieces. A physical change includes change in size and shape.

Physical or Mechanical Weathering

release or unloading is a form of physical weathering seen when deeply buried rocks are exhumed

pressure

® When rocks are ____ it expands when it gets ___ it contracts

• temperature

• heated

• cold

® Rocks are sediment grinding against each other wear away surfaces

abrasion

® Processes induced by stresses created by the freezing of water into ice. The term serves as an umbrella term for a variety of processes, such as frost shattering, frost wedging, and cryofracturing.

frost weathering

happens when plants break up rocks with their growing roots or plant acids help dissolve rock

organic weathering

can also cause weathering by digging holes for food or home to live in, the animal may break apart rock

burrowing animals

cause by a chemical reaction. One substance changed to another

chemical weathering

® Breakdown of rock caused by its reaction its water

hydrolysis

® Happens when soluble minerals found in rocks are dissolved by water

dissolution

is the process by which certain minerals are dissolved by acidic solutions. For example, calcite in limestone is dissolved easily by

solution weathering

® When water and oxygen mix with iron it creates rust. This called ___

o WATER + OXYGEN + IRON = RUST

oxidation

is the mixing of water with carbon dioxide to make carbonic acid.

carbonation

®  is a form of chemical bonds of the mineral are changed as it interacts with water. One instance of hydration occurs as the mineral anhydrite reacts with groundwater.

hydration