Beds of this material, out of sight beneath the soil, are common.
由这些颗粒物质组成的地层很常见，通常位于土壤下方看不见的位置。
Amorphous material is one of the most active part of the solid phase of soil.
无定形物质是土的固相中很活跃的一个组成部分。
The images also will show the amount of organic material in the soil.
同时这些图还会显示土壤里有机物质的量。
Which the soil was made and is called the parent material.
下面的亚土壤是土壤起始形成的地方，称为母质。
Which the soil was made and is called the parent material.
下面的亚土壤是土壤起始形成的地方，称为母质。
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