Exogenic Processes (Weathering) Flashcards
A geological event that happens on the surface of the Earth.
Exogenic Process
It is a process where rocks, soil and minerals are broken down or worn away over time by natural elements.
Weathering
breakdown of rocks into pieces without any change in its composition
Mechanical
- due to tectonic forces, granite may rise to form a mountain
Pressure
Rocks expand and are fractured when expose to high _________.
Temperature
However, if the temperature drops to 0°C, the rocks will ________ and ________.
Expands and causes fractures
when water accumulates in the crack and at that point freezes, the ice expands and breaks the rock apart
Frost wedging
The breakdown of rocks is caused by impact and friction.
Abrasion
This primarily occurs during collision of rocks, sand, and silt due to current or waves along a stream or seashore causing sharp edges and corners to wear off and become rounded.
Abrasion
The roots grow causing penetration into the crack, expand, and in the long run, break the rock.
Organic Activity
Activities such as digging, quarrying, denuding forests and cultivating land contribute to physical weathering.
Human Activity
Animals like rats, rabbits and squirrels excavate into the ground to create a space for habitation.
Burrowing Animals
Involves the change
in composition and structure of rocks and minerals through chemical reactions
Chemical
It occurs in specific minerals which are dissolved in water.
Dissolution
2 examples of these minerals that dissolve in water.
Halite (NaCl) and Calcite (CaCO3)
The formation of stalactites and stalagmites in caves are brought about by what chemical reaction?
Dissolution
Rock-forming minerals like amphibole, pyroxene, and feldspar react with water and form different kinds of clay minerals.
Hydrolosis
What are those 3 minerals that react with water and forming a clay again?
amphibole, pyroxene, and feldspar
It is the response of oxygen with minerals.
Oxidation
If the _____ oxidizes, the mineral in rocks decomposes.
IRON
If the iron oxidizes, the mineral in rocks decomposes. What is this chemical reaction under oxidation?
Rusting
________ is the separation and removal of weathered rocks due to different agents like water, wind, and glacier that causes transportation of the material to where they are deposited.
Erosion
_________, ________, and ______ play an important role in the erosional process.
Plants, animals, and humans
Rocks build up in a single place because of erosion, creating a layer of rocks and minerals.
Deposition
