What is associated with the presence of red and yellow in a soil horizon?
A) a high percentage of lime and gypsum
B) a lack of iron oxide
C) a low organic matter content
D) a high percentage of sand
Correct Answer:
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Q74: What does topsoil contain?
A) ozone
B) humus
C) freshly fallen leaves
D) aquatic plants
Q75: What refers to the dissolving of material
Q76: Which soil type consists of leaf mould,a
Q77: Which topsoil is the most fertile?
A) yellow
B) red
C) grey
D) dark brown
Q78: What gives rise to the C soil
Q80: What is the common name of the
Q81: What are the primary drivers of the
Q82: What is associated with condensation nuclei?
A) animal protein
B) carbon
Q83: What has the most influence on soil
Q84: What percentage of the Earth's surface is
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