Which increase the rate of soil formation? Check all that apply.

mixed layers
large grain sizes
more precipitation
warmer temperatures
very hard parent material

large grain sizes, more precipitation, warmer temperatures.

Explanation:

Soil is the thin layer of material covering the earth's surface and they are usually formed through the process of weathering of rocks. The soil consists of mainly mineral particles, organic materials, air, water and living organisms and they interact with each other.

Large grain sizes, more precipitation, warmer temperatures are the factors that increase the rate of soil formation.

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c. the initial amount of money placed in the savings account