Soil Test Review. 2013-2014. There is a layer of water under the soil. Soil - dirt has always been here. River valleys were created by earthquakes or movements of the earth. Mountains and valleys have always been on Earth. Water comes on shore as waves and evaporates.
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Organic matter decomposes/breaks down into
Soil that is rich in organic matter has a high degree of
When earthworms add their wastes to the soil, then die and decay in the soil, they are contributing to the formation of
The best type of soil for plants to grow in is called
Loam is composed of
Soil begins to form when the solid layer of rock called _____________weathers.
Most decomposers will be found in this soil layer.
Soil decomposers include
Has topsoil always been present on Earth?
The numbers on a bag of manufactured fertilizer represent the amount of
When it rains, the soil holds water well and becomes moist and sticky. The soil probably contains a large amount of ________.
If you were to throw a handful of sand, a handful of silt and a handful of clay into a river, which particle would settle out to the bottom first?
Which of the following processes most directly helps create soil from rocks?