Which two statements describe how soil horizons are formed? A: Water evaporates from the ground
B: Humus slowly turns into bedrock
C: dead plant material mixes with sediment
D: Rock is weathered into smaller pieces

its dead plant materials and rock is weathered into small peices

Explanation:

answer : haversian

[explanation: -(compact bone is organized as parallel columns, known as haversian systems, which run lengthwise down the axis of long bones. these columns are composed of lamellae, concentric rings of bone, surrounding a central channel, or haversian canal, that contains the nerves, blood vessels, and lymphatic system of the bone)]

this age may represent the age of the earth's accretion, of core formation, or of the material from which the earth formed. this dating is based on evidence from radiometric age-dating of meteorite material and is consistent with the radiometric ages of the oldest-known terrestrial and lunar samples.