Lab 1 Flashcards
What are the five soil forming factors?
Climate, biota, parent material, topography, time
Igneous Rocks are composed of?
primary minerals (quartz feldspar, mica)
Coarser grained soils =
slower weathering
Sedimentary Rocks are?
Sandstone, shale, limestone
Why do sink holes form where there are sedimentary rocks?
There rocks weather a lot and they form caves and are what formed Karst topography and the bluegrass landscape
What are the two types of weathering?
Chemical and Physical
What is chemical weathering?
altering the composition of the mineral
What conditions are ideal for chemical weathering?
High temperature, high precipitation, and small particle sizes.
What is physical weathering?
Disintegration. (wind, water, freeze-thaw, roots, soil animals, people)
What are the processes of chemical weathering?
Hydrolysis, hydration, carbonation, dissolution, and oxidation-reduction
What is Hydrolysis?
adding water across a bond
What is hydration?
adding water to a chemical structure
What is carbonation?
Co2 dissolving in water
What is dissolution?
minerals dissolving in water
What is oxidation-reduction?
loss and gain of electrons (moving from Fe2 to Fe3)
What is complexation?
It’s the equation that looks really complex, it is mediated by soil biological processes
How does particle size relate to pH reaction?
coarse size is minimal color change and fine size is bright pink color
Why does the fine texture react more?
the fine particle size exposes greater surface area
How does rainfall correspond with pH?
More rainfall = lower pH
a higher pH mean what if HCl is added
more bubbling
What does pH indicate in regards to weathering?
a lower soil pH indicates a more weathered soil
