Earth Sci

Front 1

Exogenic Process

Back 1

The geological phenomena and processes which occur on and originate from the Earth's surface.

Front 2

Weathering

Back 2

The breakdown of the materials of Earth’s crust into smaller pieces

Front 3

Physical Weathering

Back 3

Process by which rocks are broken down into smaller pieces by external conditions.

Front 4

Frost wedging

Back 4

caused by the freezing and thawing of water that seeps into cracks of rocks

Front 5

Salt Crystal Growth

Back 5

force exerted by salt crystal that formed as water evaporates from pore spaces or cracks in rocks can cause the rock to fall apart.

Front 6

Abrasion

Back 6

caused by the rubbing and/or bouncing of rocks with each other

Front 7

Exfoliation/Unloading

Back 7

peeling away of large sheets of loosened rock materials

Front 8

Biological Activities

Back 8

(Plant roots, Burrowing of animals)

Front 9

Chemical Weathering

Back 9

The process that breaks down rock through chemical changes

Front 10

Dissolution

Back 10

dissociation of molecules into ions such as dissolution of limestone in acidic water. This process is sometimes called carbonation. CO2 + rainwater = Carbonic Acid

Front 11

Oxidation

Back 11

Oxygen + Water + Iron = Rust through the Chemical reaction called Oxidation

Front 12

Hydrolysis

Back 12

Water weathers rock by dissolving it.

Front 13

Living Organisms

Back 13

Lichens that grow on rocks produce weak acids that chemically weather rock

Front 14

Acid Rain

Back 14

Compounds from burning coal, oil and gas react chemically with water forming acids. Acid rain causes very rapid chemical weathering.

Front 15

Mass Wasting

Back 15

is the process of downslope movement of rock, regolith, sand and soil under the direct influence of gravity. It is also known as mass movement or slope movement

Front 16

Excess Moisture

Back 16

pore pressure increases, this reduces shear strength

Front 17

Low Moisture

Back 17

also reduces shear strength

Front 18

Intermediate Moisture

Back 18

soil sticks together, shear strength is highest