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| About 21% of the Earth's atmosphere is ____________ |
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| When a soil is waterlogged, the oxygen content of the soil's air tends to _____________ |
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Definition
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| Molecules of gas move by diffusion down a __________ gradient |
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| B Horizons tend to be ___________ aerated than A horizons. |
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| Sandy soils have _________ large pored than clay soils. |
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Definition
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| An acre furrow slice of soil weighs about ______________. |
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| The boundary between two watersheds is a _____________. |
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Definition
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| Water will flow out of the ___________ into a hole. |
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| To have a flowing artesian well, the recharge area for the aquifer must be __________ than the top of the well. |
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Definition
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Term
| The Darcy's law conductivity of a soil __________ with drying. |
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Definition
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Term
| Water tends to flow __________. |
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Definition
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| Water tends to flow _________ |
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Definition
| from larger to smaller pores. |
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Term
| At the permanent wilting point of a soil, the relative humidity of the soil air is ___________ |
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Definition
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Term
| A lone silicon-oxygen tetrahedron carries a charge of _________ |
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Definition
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Term
| Apatite is a non-silicate mineral that supplies _____________ to plants as it weathers. |
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Definition
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Term
| Isomorphous substitution in clay minerals results in a net __________ charge |
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Definition
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Term
| Kaolinite is a ______________ layer silicate |
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Definition
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| Cation exchange in the soil _____________ the loss of cations from the soil by leaching. |
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Definition
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| The charge on the soil sesquioxides _____________ as the pH increases. |
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Definition
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| Aluminum ions are more _________ held than calcium ion by the soil colloids. |
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Definition
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Term
| Application of ground limestone ___________ the soil pH. |
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Definition
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Term
| Sodic soils have high levels of ____________ |
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Definition
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Term
| Humans are __________ mammals |
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Definition
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| Nitrification makes the soil _________acid. |
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Definition
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Term
| If the C/N ratio of a substrate being decayed is greater then 20, the decay microbes will __________. |
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Definition
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