WASTE, EXO,& ENDO Flashcards
ARE PROCESSES THAT TAKE PLACE AT OR NEAR THE EARTH’S SURFACE THAT MAKES THE SURFACE WEAR AWAY. EXOGENIC PROCESSES ARE VERY DESTRUCTIVE, THEY ARE RESPONSIBLE FOR DEGRADATION AND SCULPTING THE EARTH’S SURFACE.
EXOGENIC PROCESSES
THE PROCESS THAT BREAKS DOWN ROCK INTO SMALLER PIECES
The disintegration of rocks, soil and minerals together with other materials through contact with Earth’s subsystems. The breaking down of soil and rocks happen in situ or on the spot.
WEATHERING
breaking down of larger rock into smaller rocks. No chemical change to rock Example - Freeze thaw action
Mechanical
a chemical reaction occurs in the rock causing it to dissolve and forming new substances. Example - Limestone dissolved by rainwater, forming calcium carbonate in caves
Chemical
disintegration of rocks due to the actions of plants/animals
Biological
occur on or near the surface Of Earth. They are usually influenced or driven by gravity, water, wind and organisms. These could be destructive occurrences that leave significant changes on the landscape and even in the ecosystem of an area. In extreme cases, it can wipe out majority of the organisms inhabiting that area.
EXOGENOUS (external)
Thermal expansion and contraction repeated heating and cooling of materials cause rigid substances to crack and separate
Weathering
The uplift and erosion of rocks overlying igneous rocks because pressure on igneous rocks is reduce exfoliation.
Unloading
slabs of outer rock separate and break loose
is the removal of great weights of rock or ice that lie on the surface…. The process releases pressure on underlying rocks and causes them to expand upward and crack at the surface. As a result, greater areas of rock are exposed to mechanical and chemical weathering.
Exfoliation
THOSE ROCK PARTICLES GET CARRIED AWAY BY WIND, WATER, ICE & GRAVITY
erosion is the action of surface processes (such as water flow or wind) that removes soil, rock, or dissolved material from one location on the Earth’s crust, and then transports it to another location (not to be confused with weathering which involves no movement)
EROSION
refers to the disintegration or disaggregation of rocks by physically breaking them apart
Physical weathering
Means that the surface of the rock is weathered due to the action of wind, water & gravity
Abrasion
Freezing-Thawing_water expands when it freezes
Frost wedging
rock breaks off into leaves or sheets along joints which parallel the ground surface;
caused by expansion of rock due to uplift and erosion; removal of pressure of deep burial
Exfoliation or unloading
repeated daily heating and cooling of rock,
heat causes expansion; cooling causes contraction.
different minerals expand and contract at different rates causing stresses along mineral boundaries.
Thermal expansion
In the same way in which sugar dissolves in tea, some minerals and rocks dissolve in rainwater.
SOLUTION
is very similar to solution. It alfects rocks that are made up of calcium carbonate e g chalk and limestone Rainwater picks up carbon dioxide (CO2) in the air, so becomes a weak carbonic acid This then reacts with calcium carbonate (found in rocks such as chalk/limestone) to form calcium bicarbonate which dissolves weak points in the rock, forming cracks (see photo on left)
CARBONATION
chemical reaction of a substance with oxygen causing a rust material to form
Oxidation
chemical reaction of a substance with oxygen causing a rust material to form
Oxidation
Types of Chemical Weathering
Carbonation
Hydrolysis
Hydration
Oxidation
Solution
FACTORS THAT AFFECT PHYSICAL WEATHERING
ICE WEDGING, RELEASE OF PRESSURE, GROWTH OF PLANTS, ANIMALS, ABRASION
FACTORS THAT AFFECT CHEMICAL WEATHERING
WATER, OXYGEN, CARBON DIOXIDE, LIVING ORGANISMS, ACID RAIN
the chemical reaction of minerals with water
causes more chemical weathering than any other type
Feldspar reacts with water
Hydrolysis
is the movement of rock, soil and regolith downward due to the action of gravity.
a collective term for a downslope transport of surface materials in direct response to gravity.
Mass wasting
The BREAKING DOWN of rock.
Weathering agents include: Water Ice, Wind Animals Growing Plants
Weathering
The DROPPING of sediment in a NEW place.
Deposition
ARE THOSE AREAS FOUND UNDER THE SEA THEY CAN BE RELATIVELY INACTIVE AREAS WHERE DEPOSITS OF SEDIMENT SLOWLY COLLECT OR ACTIVE AREAS WHERE TECTONIC PLATES MEET
OCEAN BASINS
It is a natural process in which a material is carried to the bottom of bodies of water and forms to solid.
SEDIMENTATION
most common in high- latitude or high- elevation tundra regions that have permafrost.
is the slow downhill flow of soil.
Solifluction
a type of mass wasting that can only be seen and be measured over a long period of time.
Creep
Solifluction
Slow mass wasting
the principal force for mass wasting
Gravity
Rapid movements are commonly found in steep slopes while slow movements are found on gentle slopes
Oversteepened slope
rainwater adds weight and acts as a lubricant to weathered
Water
It is a vibration and also a factor that triggers mass wasting
Earthquake
Factors that affect mass wasting
- Slope angle
- Presence of water
- Presence of vegetation
a type of mass movement in which much of the involved material is pulverized that is broken into small fragments. powdery
Avalanche