Glossary AT 2 Flashcards
Weathering
Rocks being broken down into smaller pieces over a long period of time. Happens through natural processes (usually wind or water, temp changes, etc)
Erosion
Legit just weathering + the movement of the broken down pieces. Changes shape of land
Deposition
The end part of erosion - The movement of eroded materials has finished and have been deposited at a new location
Mass Wasting
A rapid form of erosion that works primarily due to gravity in combination with other erosional agents. It occurs very quickly and can result in either small or large scale changes to the landscape depending on the type of event.
Karst landscapes
Terrain shaped by dissolution of limestone or other carbonate rocks, resulting in features like caves, sinkholes, and underground rivers.
Forms cause of carbonation (usually)
Kinda like MC amplified world but realistic scale
Dissolution
The process of a substance being dissolved into a liquid, in geo referring to minerals or rocks dissolving in water.
Igneous rock
Forms from the cooling and solidification of molten rock (magma or lava).
Sedimentary rock
Formed from the accumulation and cementation of sediments like sand, silt, and shells.
Metamorphic rock
Formed when existing rocks are transformed by heat, pressure, or chemical reactions.
Silicate Materials
- A silicate material is a substance that contains silicon, oxygen and usually one or more metals.
- Very common in rocks and minerals (90% of all rocks in Earths crust)
(~95% of igneous rocks and a huge part of metamorphic and sedimentary rocks are silicate minerals)
Foliation
When metamorphic rocks form in thin layers (bands) due to pressure and heat.
These layers create ‘weak spots’ that make it easier for mechanical weathering (like freezing or plant roots) to break the rock apart.
Fracture + Fault + Joint
Fracture = a general term for any break/crack in a rock, meaning it includes both faults and joints
Fault = A fracture where the rock has clearly shifted, (could be up/down, or it slid sideways) caused by tectonic forces
Joint = A fracture where there is no movement on either rock - the rocks cracked, but hasn’t shifted at all. Caused by cooling, pressure release, weathering
Bedrock + Carbonic Bedrock
Pedestals + Monadnocks
Runoff
Rill and Gullies
Arêtes
Plucking
Striae
Angle of Repose
Talus/Scree
Regolith
Hanging Valley
Truncated Spur