EXOGENIC Flashcards
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