Which 2 statements describe how soil horizons are formed? A. Humus slowly turns into bedrock
B. Dead plants material mixes with sediment
C. water evaporates from the ground
D. Rock is weathered into smaller pieces

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the cost of mining is extremely low compared to the money earned from mining, creating income to improve the environment.

the nitrogen cycle provides nitrogen to the ecosystem from the atmosphere, ground and oceans. nitrogen is an important component of complex molecules such as amino acids and nucleotides, which lead to the creation of proteins and dna, the building blocks of all life. plants absorb nitrogen in the form of ammonium, nitrate ion and, on rare occasions, as amino acids. animals receive nitrogen necessary for biological processes from feeding on living or dead organic matter.