soil Flashcards
1
Q
soil
A
loose mixture of rock particles, minerals, decayed organic material, air, water that came from sediments
2
Q
4 ingredients
A
sand. silt, clay, organic matter
3
Q
organic matter
A
dead animals and plants, animal waste
4
Q
what does organic matter do
A
provide nutrients and hold water
5
Q
inorganic matter
A
rock particles, sediments… things never alive
6
Q
5 factors of soil formation
A
parent materials, climate, topography, biota有机物, time
7
Q
how does soil formation starts
A
bed rock weathered
8
Q
top soil-A horizon
A
crumbly, dark brown, with clay humus腐殖质 minerals
9
Q
subsoil-B horizon
A
a little bit of topsoil clay, little humus, other particles from top soil
10
Q
C horizon
A
bottom layer containing weathered rock
11
Q
bedrock
A
igneous, sedimentary, or metamorphic
parent material, weathered to form other layers
12
Q
grass roots rock and roots weathered rock fragments bedrock
A
humus topsoil subsoil c horizon bed rock
