Download Soils - Oxnard College

Soils
1- What is a pedon?
A) A soil profile with different exposed layers B) A type of soil
created from
D) A type of stone
C) The rock soil is
2- How many layers are in a pedon?
A) 3
B)4
C)5
D)6
3- What is Humus?
A) Mixture of minerals and salt
B) A type of plant
C) A soil
D) Decomposed
organic materials
4- What is Eluvation?
A) Process of soil hardening
B) A soil found in deserts
rinses upper horizons and removes particles
minerals in horizons
C) Processes in which water
C) Process by which water deposits
5- Soil structure refers to
A) The size of soil particles
B) the cohesion of soil particles C) The arrangement of soil
particles
D) non of the above
6- Pores in a soil horizon control
A) Temperatures
B) Arrangement of soil particles C) The color of soil
D) Moisture
storage
True or False
1) A moist soil is filled to about half of field capacity
2)
Rounded Peds are more productive for plant growth
3) When a soil is at Field capacity it has the minimum water availability for use
4)
Humus is found in the 0 horizon
5) Solum consists of the 0 and A horizons only
0 horizon, A horizon, B horizon, C horizon, E horizon, R horizon.
Horizon Match
1- Made mostly of organic matter
2- Hard rock bottom made of either loose rocks or bedrock
3- Contains Humus and lots of clay particles
4- Is constantly leached of oxides, clays, and aluminums
5- Constantly Accumulate Clays and aluminums by deposition
6- Lacks clay, generally made up of minerals like salts and silicas