EXOGENIC Flashcards
(21 cards)
It includes geological phenomena
and processes that originate externally to the Earth’s surface. They are genetically related to the atmosphere, hydrosphere and biosphere
Exogenic Process
the on – site breakdown of rock and its eventual transformation into sediments
WEATHERING
Types of Weathering?
Mechanical, Chemical, Biological
Also known to be PHYSICAL
WEATHERING. It refers to the physical breakdown of a rock into unconnected grains or chunks without changing its composition.
MECHANICAL WEATHERING
Types of Mechanical Weathering?
Exfoliation, Frost Wedging, Root Wedging, and Thermal Expansion
A form of mechanical weathering in which curved plates of rock are stripped from rock below.
Exfoliation
In temperate regions, or high altitudes, water inside the fractures of rocks experience regular freezing and thawing, thus it causes the joints to expand and grow, causing pieces of rocks to detach.
Frost Wedging
Joints also expand and grow, causing pieces of rocks detach.
Root Wedging
Occurs when a rock is exposed to high temperature such as forest fire
Thermal Expansion
Occurs when there are chemical changes in at least some of the composition of the rock
Chemical Weathering
Types of Chemical Weathering
Dissolution, Hydrolysis, Oxidation, and Hydration
Happens in certain minerals which are dissolved in water
DISSOLUTION
Occurs when water reacts with the minerals and breaks them down
HYDROLYSIS
the reaction of oxygen with minerals in the rock, forms oxides
OXIDATION
Occurs when water is absorbed into the crystal structure of the mineral, causing it to expand
HYDRATION
occur in roots of plants, fungi and lichens secrete organic acids that dissolves minerals and nutrients
BIOLOGICAL WEATHERING
the separation and removal of weathered and unweathered rocks and soil from its substrate due to gravity or transporting agents like wind, water or gravity
EROSION
It commonly occurs in flat, bare areas or dry, sandy, and loose soils and detaches soil particles and transports them by the wind.
WIND EROSION
occurs when rain or snowmelt displaces the soil on the ground and is the most common erosion agent
WATER EROSION
Also known to be mass movement and it refers to the downslope movement of rock, soil and ice due to gravity
MASS WASTING
a process in which matter, usually particles of sediment, rocks, or soil, is added to a surface. It can be transported as pebbles, sand and mud, or as salts dissolved in water and sometimes can become new landforms like mountains and river deltas
DEPOSITION