Layers of the soil are called horizons. Here are the horizons:
- Humus
- Topsoil
- Subsoil
- Fragmented rock
- Bedrock
Once a soil has developed, it forms layers called horizons. Beneath a surface layer of a plant remains, the topsoil is rich in decomposed plants and animal matter. The subsoil is mainly mineral particles, with much less organic material. The fragmented rock/bedrock is primarily small stones, and beneath it lies all bedrock.
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Answer:
true , only 50 percent organisms extinct each year
Since M is the midpoint of the segment AB
then measure of AM and MB are equal. So to solve the value of x, equate the following
measurement
AM = MB
50 – 3x = -20 + 4x
70 = 7x
<span>X = 10</span>
It has stable exports and imports as well as alliances
